Get Graphics Drivers and Hardware Transcoding BACK for Plex/Jellyfin/Emby on your Synology NAS
Note – the video on this fix will be published soon and I will update this article with images ASAP.
Synology’s 2025 refresh brought the DS225+ and DS425+ with the familiar Intel Celeron J4125, but it also quietly removed the kernel graphics driver support that Plex, Jellyfin, and Emby use for hardware transcoding of H.264 and HEVC. This guide explains what changed, why it matters for real-world streaming, and how you can restore GPU-accelerated transcoding on these models using an unofficial SSH method shared by the community. If you rely on your NAS to reshape 4K or high bitrate files for phones, tablets, hotel TVs, or limited connections, this walkthrough will help you get that efficiency back.
IMPORTANT – Massive credit to RROrg group over on Github for ‘cracking the nut’ on this with their latest repo HERE
Additionally, credit to Luka @ Blackvoid, who made this great article, covered this first and gave me permission to use his guide here and in my upcoming video. Read his article HERE
What Happened to Hardware Transcoding on the Synology 2025 NAS, and Why Is This a Problem
When Synology launched the 2025 “x25” lineup, users expected a minor refresh of familiar models like the DS225+ and DS425+. Instead, they discovered that Synology had removed the i915 graphics driver from DSM, effectively disabling hardware transcoding on the Intel Celeron J4125 CPU. This meant that Plex, Jellyfin, and Emby could no longer tap into the iGPU’s Quick Sync Video capabilities. Synology confirmed the change in support tickets, explaining that both H.264 (AVC) and H.265 (HEVC) transcoding had been deliberately blocked at the kernel driver level. The company cited licensing costs for HEVC, even though AVC is license-free, and argued that most client devices already support native playback. The earliest and longest discucssions on this topic are HERE on this Plex Forum thread.
The result is a significant downgrade for users who bought these models expecting the same multimedia performance as their predecessors. Instead of 10–20% CPU usage during hardware-accelerated transcoding, users now see 80–100% CPU utilization when reshaping video on the fly. For remote streaming, converting 4K to 1080p or 720p becomes slow, inefficient, and often unworkable. This change undermines the value proposition of the J4125 platform and leaves Plex and Jellyfin users with hardware that is technically capable but artificially restricted, creating frustration across the Synology community.
Disclaimer: This Is Unofficial – Know the Risks!
Before diving into the workaround, it is important to understand that this method is not supported by Synology and involves altering core system modules via SSH. These steps rely on community-compiled drivers and are provided “as is,” without warranty. Making changes at the kernel level can cause instability, break after DSM updates, or in the worst case, lead to data loss if mistakes are made. You should always keep verified backups of your data before proceeding, and only attempt this if you are comfortable working with the command line and root-level access. Proceed entirely at your own risk.
Step By Step Guide to Get J41225 Graphics Drivers Hardware Transcoding Back
Log into DSM and create a new Shared Folder (e.g. scripts) on your main volume.
Make sure your DSM account has full access, since root privileges will be needed later.
Upload the Archive
Use File Station or SMB to upload the .zip file into the new scripts shared folder.
Once uploaded, extract it on the NAS by right-clicking and selecting Extract Here.
If extraction creates subfolders, move the relevant script files (such as transcode_4_x25.sh) directly into the main scripts directory for easier referencing.
Set the event to Boot-up so the script runs every time the NAS restarts.
Point to the Script
In the task settings, paste the full path to the script file, for example:
sh /volume1/scripts/transcode_4_x25.sh
If unsure, right-click the .sh file in File Station, select Properties, and copy the full directory path.
Confirm and Save
DSM will warn you about using root and non-standard scripts. Acknowledge this and proceed.
Enter your DSM admin password when prompted.
The scheduled task will now appear in the list.
Run the Script
Right-click the new task and select Run to execute it immediately.
Optionally, reboot your NAS to confirm that the driver loads automatically on startup.
Verify Hardware Transcoding
Open Plex (or Jellyfin/Emby) and play a file requiring transcoding.
Check playback statistics: you should now see HW (hardware transcoding) instead of CPU-only usage.
Conclusion
Synology’s decision to remove iGPU drivers from the 2025 DS225+ and DS425+ left many users frustrated, especially those who rely on Plex or Jellyfin for remote streaming. While the company cites licensing costs and client-side decoding as justification, the hardware itself remains fully capable of transcoding. Thanks to community-driven efforts, it is possible to re-enable Quick Sync on these models with an SSH-based workaround. This fix restores the efficiency and functionality users expected, though it comes with risks and requires maintenance after reboots. For multimedia enthusiasts who value hardware transcoding, this unofficial solution may be the only way to unlock the true potential of these NAS systems.
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AI Console for Synology Mail Plus and Synology Office – But Should You Use It?
Note -Thanks again to Daniel from Germany for all his support and assistance for this video. Visit his site HERE
Synology has introduced a new software package called AI Console, aimed at integrating third-party AI and large language model (LLM) services directly into select Synology productivity applications. The package is available on devices running DSM 7.2 or later and supports only certain x86-64 NAS models, reflecting the higher processing and memory requirements of AI workloads.
Rather than running its own local AI engine, Synology provides a centralised management tool for connecting to established AI providers, including OpenAI, Azure OpenAI, Google Gemini via AI Studio or Vertex AI, Amazon Bedrock, and Baidu AI Cloud. Once linked using the administrator’s API key, these services can be used within Synology MailPlus and Synology Office to perform tasks such as summarising long emails, generating responses, translating text, adjusting tone, and producing refined document content.
The AI Console is designed with administration and control in mind. It allows system managers to configure access on a per-package basis, selectively enabling or excluding AI features for specific users or groups. Advanced options include setting daily or per-minute token limits for each user to control consumption and manage costs, as usage charges are determined by the chosen AI provider rather than Synology itself. For privacy protection, the Console supports a de-identification process that can mask predefined categories of sensitive data before prompts are sent to an AI provider, with the original data restored after the response is received.
Administrators can monitor adoption and usage trends through transaction logs, which capture request details such as timestamps, IP addresses, API models used, and token counts, alongside admin logs that record configuration changes. While the AI Console does not add AI functionality to all DSM applications, it focuses on extending the business-oriented MailPlus and Office suite. However, this is not a move that will please all Synology owners or buyers, as some value their NAS primarily for complete local data control and may view any cloud-connected AI integration as an unnecessary or risky addition.
Why is Synology AI Console So Contentious?
The idea of adding AI functionality to a NAS is divisive because many users adopt these systems specifically to avoid reliance on cloud-based services. A key selling point of a Synology NAS has long been the ability to store, process, and back up data entirely within the user’s own premises, retaining full control over where that data resides and who can access it.
By design, the Synology AI Console connects to external AI providers through API calls, meaning that text-based content from MailPlus or Office documents is transmitted to third-party servers for processing. Even with encryption in transit and privacy safeguards such as de-identification, this external dependency conflicts with the expectations of users who purchased a NAS to minimise exposure to external networks. This tension is heightened by the fact that the AI operations do not run locally on the NAS hardware, which for some buyers undermines the appeal of integrating AI into a device marketed for self-contained operation.
Another factor making AI use contentious is the trust and compliance aspect. Many NAS deployments are in small businesses, professional environments, or home offices handling sensitive material. Sending even anonymised extracts of communications or documents to an external service raises compliance questions for organisations bound by strict data protection rules, especially in regulated industries such as healthcare, finance, or legal services.
While the AI Console provides administrative controls, auditing tools, and the option to disable AI entirely for certain users or packages, the underlying reality remains that data is leaving the local network for processing. This creates a fundamental divide between those who welcome AI for its productivity benefits and those who see any form of off-device data processing as incompatible with the core value proposition of a private NAS.
What Security Provisions Have Synology Put in Place?
Synology’s AI Console incorporates multiple layers of control to reduce the risks associated with transmitting data to third-party AI providers. API keys for connected AI services are stored locally on the NAS rather than in the cloud, and all requests are sent directly from the device to the selected AI provider. Administrators can remove these keys at any time, immediately severing the connection. The system allows AI access to be enabled or disabled at the package level, with the option to exclude specific users or groups entirely. To prevent uncontrolled consumption, administrators can set token rate limits per user, measured either per minute or per day. Transaction logs record each AI request with details such as timestamp, source IP address, user account, API model used, and token usage, while admin logs document any configuration changes. This creates a verifiable audit trail for compliance and internal review.
Key security provisions include:
Local storage of API keys, with no cloud-based key management.
Direct communication between the NAS and the AI provider, bypassing Synology’s own servers.
Ability to revoke API access instantly by deleting stored keys.
Per-package AI enable/disable controls, with user and group-level exclusions.
Token rate limiting to control per-user API usage.
Detailed transaction logs for all AI requests.
Administrative logs for configuration changes.
Optional logging of request inputs and outputs for auditing.
For added privacy, Synology offers a de-identification feature that can mask selected categories of sensitive data before they are transmitted to the AI provider, restoring the original information once the processed output is returned. This feature can identify and anonymise common identifiers such as names, email addresses, IP addresses, banking details, and various country-specific personal or business numbers. De-identification relies on a combination of AI-driven semantic analysis and predefined regular expression rules, giving administrators control over which data types are masked. It requires the installation of the Container Manager package and a minimum of 8 GB of RAM, with each enabled language model consuming roughly 1 GB of memory. Although Synology notes that de-identification cannot guarantee 100% masking, the mechanism is intended to significantly reduce the chance of exposing sensitive details during AI processing.
Synology Mail Plus and AI Console Integration
When enabled for Synology MailPlus, the AI Console provides a set of functions aimed at improving email efficiency through automated text processing. Within the MailPlus interface, users can generate short or detailed summaries of incoming emails, which can help quickly assess lengthy messages without reading them in full. The AI assistant can also draft replies based on user instructions, with options to adjust tone, length, and formality, or translate the response into a supported language. All AI processing is text-based, with attachments excluded from transmission to the AI provider. The system also supports “Help me write” prompts directly within the reply editor, allowing for quick generation of tailored responses that can be inserted and then edited before sending. Importantly, these capabilities are only available to users granted AI permissions by the administrator, and all actions are recorded in transaction logs for review.
The integration offers multiple editing refinements, including making a message more formal or casual, shortening or lengthening text, and translating to or from languages supported by the connected AI model. Users can also rephrase replies entirely or request alternative drafts. Although these capabilities are similar to features found in other email platforms that integrate AI, the implementation within MailPlus is designed to remain under the control of the NAS administrator, with optional de-identification masking personal data before it is sent to the provider. Responses are generated by the third-party AI service configured in AI Console, and processing occurs only when the user explicitly invokes an AI function, avoiding any automated sending of content without user action.
From a functional perspective, MailPlus AI integration is targeted primarily at professional or business environments that run their own Synology-hosted mail server. It can streamline response drafting, reduce time spent on routine communication, and support multilingual correspondence. However, the scope is currently limited to text-based tasks, with no AI-driven attachment analysis, advanced categorisation, sentiment detection, or automated email sorting included. The feature set also lacks customisable style profiles beyond the basic tone and length adjustments, meaning more specific brand or sector language must still be applied manually. The value for each organisation will depend on how frequently staff interact with longer, more complex emails, and whether the trade-off of involving an external AI service aligns with internal data handling policies and compliance requirements.
Synology Office and AI Console Integration
In Synology Office, AI Console integration extends across the suite’s document, spreadsheet, and presentation tools, embedding AI-assisted functions within the existing editing interface. In documents, the AI assistant can summarise entire files, rewrite selected sections, adjust tone, translate content, or improve grammar. These actions can be applied either through a right-click contextual menu or via a dedicated AI sidebar that displays results alongside the original content. Users can choose to insert AI-generated revisions directly into the file or keep them separate for manual comparison. The system maintains Office’s existing version history, meaning any AI-driven edits can be rolled back without data loss.
In spreadsheets, the integration is aimed at assisting with formula comprehension and basic data interpretation. Users can request explanations of specific formulas, generate new formulas from plain-language prompts, or run simple calculations without manually writing functions. The AI can also produce summaries of table data, although its analytical depth is limited compared to dedicated business intelligence tools. As with documents, processing is restricted to text-based content; the system does not transmit embedded images or charts to the AI provider. Administrators can control whether AI features are available in spreadsheets, allowing them to be enabled for certain user groups while remaining disabled for others.
For presentations, the AI can refine slide text, translate content, or expand bullet points into fuller sentences, making it useful for producing alternate versions of existing material. The functionality mirrors what is available in documents, with tone and length adjustments as well as grammar checks. However, it does not currently create entirely new slide decks or visual layouts from prompts. The processing workflow remains the same across all Office formats: only when a user explicitly triggers an AI action is the relevant text sent to the configured provider, and all requests are recorded in the AI Console’s transaction logs.
Overall, the Synology Office integration offers consistent AI tools across its core applications, focusing on editorial and language-based support rather than data-driven automation. While the scope is narrower than AI-enabled features in some third-party office suites, the implementation maintains administrative control and allows for selective deployment, making it adaptable to environments where privacy considerations limit the use of external services.
What Features of AI/LLM Are Not Present?
Although the Synology AI Console brings AI-assisted functions to MailPlus and Office, it does not provide the same breadth of capabilities found in some competing platforms. There is no locally hosted AI model option, meaning all processing is dependent on a live connection to a third-party provider. As a result, the system lacks offline functionality, GPU-accelerated local workloads, or support for running open-source LLMs within the NAS environment. In practical terms, this means that all AI operations involve external processing, which may not suit users who require fully on-premises data handling.
Beyond the infrastructure level, several functional gaps remain. The integration does not extend to all DSM applications, omitting areas such as File Station, Photo Station, Synology Photos, and Surveillance Station. Within MailPlus and Office, the AI features are focused on text editing and basic summarisation rather than broader automation. There is no built-in capability for sentiment analysis, advanced data analytics, automatic categorisation, or content generation from large datasets. Similarly, the AI Console does not currently allow multi-step task automation or integration with custom scripts, limiting its use to predefined actions within the supported productivity tools.
Is Synology AI Console Safe?
From a technical and administrative perspective, Synology has implemented several measures to protect data when using the AI Console. API keys are stored locally on the NAS, and requests to AI providers are sent directly from the device rather than passing through Synology-operated servers. Administrators can limit access to specific packages, exclude selected users or groups, set token usage caps, and monitor all AI interactions through detailed logs. For additional privacy, the optional de-identification feature can mask sensitive details such as personal identifiers, banking information, and IP addresses before prompts are transmitted, restoring them only after the AI provider returns a response.
However, the safety of the AI Console ultimately depends on the chosen AI provider and the user’s own policies. All processing occurs on the provider’s infrastructure, meaning data leaves the local network whenever AI features are used. Even with encryption and masking in place, this external dependency may be unacceptable in environments with strict regulatory requirements or where complete local control is mandatory. While Synology provides the tools to minimise risk and monitor usage, it is the administrator’s responsibility to select a compliant provider, configure de-identification appropriately, and ensure that AI features are only enabled where the security implications are fully understood.
Here is my video on the original reveal of AI Integration/Connection into Synology DSM when it was first shown off during the Synology Solution Exhibition back in 2023 in Taipei:
This description contains links to Amazon. These links will take you to some of the products mentioned in today's content. As an Amazon Associate, I earn from qualifying purchases. Visit the NASCompares Deal Finder to find the best place to buy this device in your region, based on Service, Support and Reputation - Just Search for your NAS Drive in the Box Below
Need Advice on Data Storage from an Expert?
Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you.Need Help?
Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry.
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We use affiliate links on the blog allowing NAScompares information and advice service to be free of charge to you.Anything you purchase on the day you click on our links will generate a small commission which isused to run the website. Here is a link for Amazon and B&H.You can also get me a Ko-fi or old school Paypal. Thanks!To find out more about how to support this advice service checkHEREIf you need to fix or configure a NAS, check FiverHave you thought about helping others with your knowledge? Find Instructions Here
Or support us by using our affiliate links on Amazon UK and Amazon US
Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.
Synology DS1825+ vs DS1821+ NAS Comparison – Get It Right, FIRST TIME!
When Synology releases a new NAS in its “Plus” lineup, users often expect a blend of practical improvements, long-term support, and a reasonable upgrade path from the previous generation. The Synology DS1825+ arrives in 2025 as the official successor to the 2020/2021-released DS1821+, carrying over much of the same core design while introducing selective enhancements—and a few contentious changes. Both are 8-bay desktop NAS systems targeted at advanced home users, small businesses, and content creators who need multi-user access, flexible RAID configurations, and extensive app support. However, while the DS1821+ was praised for its broad compatibility and modular connectivity, the DS1825+ adopts a more tightly controlled hardware ecosystem. In this comparison, we break down the key differences across hardware, ports, storage capabilities, DSM software features, and drive compatibility so you can decide which model truly fits your long-term needs—without second-guessing your choice later.
Synology DS1825+ vs DS1821+ NAS Comparison – Internal Hardware
At the center of both the Synology DS1821+ and DS1825+ is the AMD Ryzen V1500B processor, a 4-core, 8-thread embedded SoC with a 64-bit architecture and a base frequency of 2.2 GHz. This chip, built on the Zen architecture, offers a balance of power efficiency and multi-threaded performance suited for environments with simultaneous multi-user file access, virtual machines, and complex RAID configurations. Synology’s decision to retain the same processor in the DS1825+ reflects confidence in its reliability and capability. However, for users hoping for a jump to Zen 2 or Zen 3-based hardware, the lack of a CPU upgrade could be a disappointment—especially considering that competing vendors have started adopting newer architectures for their mid-range systems. Still, for typical NAS tasks that do not involve on-the-fly 4K video transcoding or GPU-heavy operations, the V1500B remains a stable and effective platform with AES-NI encryption support and virtualization compatibility across VMware, Hyper-V, and Docker workloads.
Component
Synology DS1821+
Synology DS1825+
CPU
AMD Ryzen V1500B, 4-core, 8-thread, 2.2 GHz
AMD Ryzen V1500B, 4-core, 8-thread, 2.2 GHz
CPU Architecture
64-bit (Zen)
64-bit (Zen)
Hardware Encryption
AES-NI
AES-NI
Memory (Pre-installed)
4 GB DDR4 ECC SODIMM
8 GB DDR4 ECC SODIMM
Memory Slots
2 × SODIMM
2 × SODIMM
Max Memory Supported
32 GB (2 × 16 GB)
32 GB (2 × 16 GB)
ECC Memory Support
Yes
Yes
System Fans
2 × 120mm
2 × 120mm
Power Supply
250W Internal PSU
250W Internal PSU
Power Consumption (Active)
59.8W
60.1W
Power Consumption (HDD Hibernation)
26.18W
18.34W
Noise Level (Idle)
22.2 dB(A)
23.8 dB(A)
Dimensions (H × W × D)
166 × 343 × 243 mm
166 × 343 × 243 mm
Weight
6.0 kg
6.0 kg
The most immediate improvement in the DS1825+ over its predecessor is in the system memory. While the DS1821+ ships with 4 GB of DDR4 ECC SODIMM, the DS1825+ doubles that to 8 GB by default, giving users more overhead for running DSM services out of the box. This matters in practical terms for multitasking within Synology’s ecosystem—such as simultaneous use of Synology Drive, Surveillance Station, Virtual Machine Manager, and snapshot services. For environments where users may deploy hybrid workloads (e.g., backup automation combined with real-time collaboration tools), the extra memory in the DS1825+ reduces the likelihood of performance bottlenecks or memory swapping. Both systems support up to 32 GB (2 × 16 GB), but starting with 8 GB means many users won’t need to upgrade at all. Additionally, since both units use ECC memory, they help ensure integrity in business-critical applications by reducing silent data corruption—an especially relevant factor when hosting VMs or storing sensitive files over time.
Thermal and power characteristics between the two systems remain largely consistent, with both featuring dual 120mm fans and an internal 250W PSU that can handle full drive loads with expansion units attached. The DS1821+ and DS1825+ are also nearly identical in physical size and structure, though the newer model has a slightly higher idle noise level—23.8 dB(A) versus 22.2 dB(A)—due to denser internal configuration and possibly fan speed curve adjustments. From an operational standpoint, the DS1825+ is marginally more power-efficient in idle states, consuming just 18.34W during HDD hibernation compared to 26.18W in the DS1821+. These marginal differences suggest a refinement in system tuning, although not a radical redesign. Overall, while the DS1825+ doesn’t revolutionize internal hardware, its doubled memory and subtle optimizations give it the edge for users planning to push DSM with multiple services or those who prefer an upgrade-free deployment experience.
Synology DS1825+ vs DS1821+ NAS Comparison – Ports and Connections
One of the most tangible areas of differentiation between the DS1821+ and DS1825+ lies in their external connectivity. The older DS1821+ is equipped with four 1GbE RJ-45 LAN ports, a familiar configuration that supports link aggregation and network redundancy. This setup was common in Synology’s mid-range lineup during its 2020–2022 releases, offering a total aggregated bandwidth of up to 4Gbps—assuming your switch infrastructure supports it. For many small business users, this array of ports provided simple flexibility: you could dedicate individual ports for different services or bond them for faster file transfers. However, in practice, 1GbE is increasingly becoming a limiting factor for modern workloads, especially in environments with large raw video files, database access, or multiple users performing high-speed backups.
Port / Expansion Feature
Synology DS1821+
Synology DS1825+
RJ-45 LAN Ports
4 × 1GbE
2 × 2.5GbE
Link Aggregation / Failover
Yes
Yes
USB Ports
4 × USB 3.2 Gen 1
3 × USB 3.2 Gen 1
Expansion Ports
2 × eSATA (for DX517)
2 × USB Type-C (for DX525)
PCIe Slot
1 × PCIe Gen3 x8 (x4 link)
1 × PCIe Gen3 x8 (x4 link)
NVMe M.2 Slots
2 × M.2 2280 (Cache only)
2 × M.2 2280 (Cache or Storage Pool, Synology-only)
Hot-swappable Drive Bays
8 × 3.5″/2.5″ SATA (Hot-swappable)
8 × 3.5″/2.5″ SATA (Hot-swappable)
Max Drive Bays (with Expansion)
18 (with 2 × DX517 via eSATA)
18 (with 2 × DX525 via USB-C)
The DS1825+ reflects a more current networking trend by replacing the four 1GbE ports with two 2.5GbE RJ-45 ports. While this reduces the total number of interfaces, it significantly increases throughput per port, offering an aggregated maximum of 5Gbps when bonded. This shift represents a smarter allocation of bandwidth for users with 2.5GbE-capable switches or routers, and it’s more practical than the 1GbE spread seen in the DS1821+. In small office networks or prosumer setups where simultaneous data access is routine, the DS1825+ delivers higher per-connection performance, improving large file transfers and reducing latency during remote access. Though fewer in number, the newer ports provide better real-world performance potential—and users seeking higher bandwidth can still add a 10GbE or 25GbE NIC via the PCIe slot in both models.
Beyond networking, the DS1825+ introduces a notable change in expansion port design. The DS1821+ includes two eSATA ports for attaching Synology DX517 expansion units, which align with legacy expansion practices. In contrast, the DS1825+ replaces these with two USB-C-based expansion ports, designed specifically for use with the newer DX525 expansion units. While this doesn’t directly affect day-to-day operations, it signals a move toward a USB-based proprietary interface for future expansion, likely with more streamlined cabling and higher throughput potential. Additionally, the DS1825+ trims down from four USB 3.2 Gen 1 ports to three, a minor trade-off that may impact users with multiple USB-connected devices such as UPS units or backup drives. Still, for most users, the improved network and expansion standards make the DS1825+ more forward-looking, even if it reduces legacy connectivity options found on the DS1821+.
Synology DS1825+ vs DS1821+ NAS Comparison – Storage
Both the DS1821+ and DS1825+ offer eight front-facing SATA drive bays, supporting 3.5″ HDDs and 2.5″ SSDs, with hot-swappable trays for easy maintenance and upgrades. On the surface, storage capacity and configuration appear nearly identical: both models can scale up to 18 total drives using two Synology expansion units and support RAID levels including SHR, RAID 5, 6, and 10. This makes either system a viable choice for users with large datasets, whether for media, surveillance, or business-critical file hosting. However, subtle distinctions in how storage can be configured and expanded in each model make a significant difference over time.
Storage Feature
Synology DS1821+
Synology DS1825+
Drive Bays
8 × 3.5″/2.5″ SATA (hot-swappable)
8 × 3.5″/2.5″ SATA (hot-swappable)
Max Drive Bays (with Expansion)
18 (via 2 × DX517)
18 (via 2 × DX525)
M.2 NVMe Slots
2 × M.2 2280 (cache only, 3rd-party SSDs allowed)
2 × M.2 2280 (cache or storage pools, Synology-only SSDs)
Max Single Volume Size
108 TB
200 TB (requires 32 GB RAM)
Max Internal Volumes
64
32
Supported RAID Types
SHR, JBOD, RAID 0, 1, 5, 6, 10
SHR, JBOD, RAID 0, 1, 5, 6, 10
Third-Party HDD/SSD Support
Fully supported (with warnings)
Blocked at install/init if not verified
Storage Pool Creation with Unverified Drives
Allowed
Blocked
Storage Pool Expansion (Unverified Drives)
Supported
Blocked
RAID Recovery with Unverified Drives
Supported
Blocked
Hot Spare (Unverified Drives)
Supported
Blocked
Storage Manager Behavior (Unverified Drives)
Warnings shown, but system fully functional
Persistent alerts, some functions disabled
The DS1825+ supports storage pools using its two internal M.2 NVMe slots, something the DS1821+ does not. On the older model, those slots are limited strictly to SSD caching, and even then, Synology allowed users to use third-party NVMe drives for read/write acceleration. In the DS1825+, Synology enables users to form full storage pools using M.2 SSDs—but only if those SSDs are from Synology’s own SNV3400 or SNV3410 series. This adds flexibility in theory, especially for users interested in all-flash configurations or high-speed tiers, but restricts user choice in practice. The DS1821+ offers more freedom in selecting SSDs and hard drives, with only non-blocking warning messages when using unverified models, while the DS1825+ actively blocks storage pool creation and system initialization with unlisted drives.
This tightening of compatibility extends into pool expansion, RAID rebuilds, and even hot spare assignments. In the DS1821+, users could freely mix third-party drives and expand pools over time using available or similarly specced HDDs—even those not on the official compatibility list. The DS1825+ takes a stricter approach: attempts to initialize DSM with unverified HDDs will fail, and pool expansion or RAID recovery with unsupported drives is outright blocked. While existing volumes from older NAS systems can still be migrated and booted, they will trigger persistent compatibility warnings in DSM, often with degraded system health indicators. This shift may offer Synology more control over performance validation and support consistency, but it limits flexibility for users relying on diverse or existing storage media—making the DS1821+ a better option for those with a mix-and-match approach, and the DS1825+ more suitable for fully standardized Synology deployments.
Synology DS1825+ vs DS1821+ NAS Comparison – DSM Capabilities
Both the DS1821+ and DS1825+ are powered by Synology’s DiskStation Manager (DSM) 7.2 operating system, offering access to a rich suite of applications for file management, backup, surveillance, virtualization, and cloud syncing. Core tools such as Synology Drive and Synology Photos provide a private cloud alternative to services like Google Drive or Dropbox, while packages like Hyper Backup and Active Backup for Business enable full-system and client-based data protection strategies. These services run similarly on both systems, but hardware differences can influence practical performance. For example, the DS1825+ ships with 8 GB of ECC memory by default, making it more responsive when running multiple DSM apps in parallel—such as Snapshot Replication combined with Virtual Machine Manager and Drive Client Sync. In contrast, the DS1821+ ships with 4 GB of memory, which may require an upgrade before achieving similar multitasking fluidity, especially in environments with more than a few simultaneous users.
DSM Feature / Capability
Synology DS1821+
Synology DS1825+
DSM Version
DSM 7.2+
DSM 7.2+
Max Internal Volumes
64
32 ▼ Reduced
Max Single Volume Size
108 TB
200 TB (requires 32 GB RAM) ▲ Increased
Snapshot Replication
256 per shared folder / 4,096 total system snapshots
256 per shared folder / 4,096 total system snapshots
Differences emerge in how each system handles volume structure and scaling. The DS1821+ supports up to 64 internal volumes, giving it an advantage in deployments where users need to segregate workloads—for instance, separating surveillance footage, shared team folders, user home directories, and VM storage into distinct volumes for quota management and performance tuning. This flexibility makes the DS1821+ better suited for educational institutions or small business IT teams who manage multiple user groups and need clear storage separation. The DS1825+, on the other hand, limits internal volumes to 32 but increases the maximum single-volume size to 200 TB (with 32 GB RAM installed). This makes it better aligned with large, contiguous workloads like uncompressed 4K video editing archives, security footage retention for legal compliance, or massive CAD/CAM datasets—all of which benefit more from fewer, larger volumes than from numerous smaller ones.
Service limits within DSM also subtly differentiate the two models. The DS1821+ is rated for up to 110 concurrent users in Synology Drive and Office, whereas the DS1825+ recommends a slightly lower threshold of 100 users. While the difference is marginal, it may reflect the DS1825+’s tighter memory tuning or more restrictive compatibility model, which now relies on verified Synology storage media for optimal performance. For example, in environments running Synology Office with real-time collaborative editing—paired with Drive, MailPlus, and external file sharing through WebDAV—the DS1821+ might offer more flexibility when loaded with third-party high-performance SSDs for caching. The DS1825+, restricted to Synology’s own SNV3400/3410 NVMe drives, demands tighter ecosystem compliance, which could affect responsiveness if storage performance becomes a bottleneck. Nonetheless, both models offer full support for advanced DSM modules like Synology High Availability, SAN Manager, and Hybrid Share, ensuring that users deploying in mission-critical environments still have access to the high-availability and hybrid cloud features that define Synology’s enterprise-ready platform.
Although DSM 7.2 offers the same interface and core functionality across both the DS1821+ and DS1825+, the user experience diverges notably during storage migration, particularly when using older or unverified hard drives. Users migrating existing volumes from earlier Synology systems—such as the DS918+, DS1819+, or DS920+—will find that the DS1821+ accepts those drives with minimal friction. DSM will boot normally, recognize the existing array, and issue only minor warnings in Storage Manager regarding drive verification, which are generally dismissible and do not affect functionality. RAID recovery, pool expansion, and the addition of hot spare drives all remain fully accessible, even when using third-party or previously unsupported drives. In contrast, the DS1825+ enforces stricter hardware validation: while it will mount migrated volumes, the system interface becomes saturated with persistent warning banners, amber and red health statuses, and limited drive information if the drives are not officially verified. These warnings cannot be dismissed, and attempts to rebuild RAID, add new drives to existing pools, or assign hot spares using unverified media will be blocked entirely. As a result, while both systems technically support migration, the DS1821+ offers a far more tolerant and practical transition path for users with legacy or mixed-brand storage configuration.
Synology DS1825+ vs DS1821+ NAS Comparison – Conclusion
Choosing between the Synology DS1825+ and DS1821+ comes down to whether you prioritize modern hardware refinements or broader long-term flexibility. The DS1825+ introduces subtle but meaningful upgrades: faster 2.5GbE connectivity, double the base memory, and NVMe storage pool support—features that clearly position it as the more forward-thinking choice for users committed to staying within the Synology ecosystem. However, these improvements come with tighter restrictions, most notably in its rigid drive compatibility policy. DSM cannot be installed unless only Synology-verified drives are used, and the system actively blocks unverified drives from being used in storage pools, RAID rebuilds, or even hot spare configurations. In contrast, the DS1821+ offers more freedom—supporting a wider range of HDDs and SSDs, allowing RAID recovery and expansion with non-Synology drives, and presenting a cleaner, less obstructive DSM experience when migrating from older hardware. While it may lack the newer model’s out-of-the-box performance gains, its open-ended architecture gives users—especially those with legacy drives or mixed environments—more breathing room. For users building a NAS from scratch and willing to adopt Synology’s closed hardware ecosystem, the DS1825+ is a capable and streamlined solution. But for those looking to extend the life of existing hardware or retain control over their storage media choices, the DS1821+ remains the more versatile and user-friendly option.
Aspect
Synology DS1821+
Synology DS1825+
Pros
– Full support for 3rd-party drives (HDDs & SSDs)
– Higher default RAM (8 GB ECC pre-installed)
– Supports RAID recovery, expansion, and hot spares with unverified drives
This description contains links to Amazon. These links will take you to some of the products mentioned in today's content. As an Amazon Associate, I earn from qualifying purchases. Visit the NASCompares Deal Finder to find the best place to buy this device in your region, based on Service, Support and Reputation - Just Search for your NAS Drive in the Box Below
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Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you.Need Help?
Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry.
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Synology Launches RS2825RP+ RackStation NAS for Business Deployments
As Synology continue its large-scale refresh of its solution portfolio, it is finally time to start talking about rackmount solutions! Although many were waiting on the RS1225+, it looks like the brand wants to ‘go big’ with the Synology RS2825RP+ 16 Bay, expandable 10GbE equipped and 25G Ready server solution. Arriving in the PLUS series, and therefore subject to the recent hardline storage media verification changes made by the brand for the 2025 series and onwards, the RS2825RP+ is clearly a very, very different solution and therefore perhaps reaching a target audience who are more receptive to it (maybe). Synology have a phenomenal history when it comes to their rackmount series – for many years it was just the rackstation series – but eventually we saw the UC, SA, FS and XS arrives.. which in turn is now rolling towards the enterprise challengers such as the Active Protect DP devices, the Gridstation (GS) devices and even a long desired and promised NVMe Flash series (the PAS range). So, PLUS series devices like the RS2825RP+ are occupying an increasingly squeezed area of the portfolio where buyers want comparatively affordable, scalable and capable storage. The changes by the brand on drive media support and verification do undercut this somewhat, so with that in mind, what has this new 3U Rackmount got to offer you in 2025 that makes it deserved your money and your data?
The Synology RS2825RP+ is equipped with an AMD Ryzen V1780B processor, offering a quad-core architecture with base and boost clocks of 3.35 GHz and 3.6 GHz, respectively. Designed for enterprise-grade workloads, the system includes 8 GB of ECC DDR4 memory in a single module configuration, which can be expanded up to 32 GB via two available slots. The rackmount chassis conforms to a 3U form factor and houses 16 front-accessible drive bays, supporting both 3.5” and 2.5” SATA formats. Networking capabilities include dual 1GbE ports and a single 10GbE port for high-speed data transfer, with a PCIe Gen3 slot offering further upgrade flexibility for additional NICs or storage controllers. According to Synology’s internal benchmarks, the unit delivers up to 3,519 MB/s sequential read and 1,790 MB/s write performance, which is suitable for multi-user environments requiring fast data access and sharing.
16 x 3.5″/2.5″ SATA (expandable to 28 bays with 1 x RX1225RP)
Hot Swappable Drives
Yes
Expansion Slot
1 x PCIe Gen 3 x8 (x4 link)
LAN Ports
1 x 10GbE RJ-45, 2 x 1GbE RJ-45
USB Ports
2 x USB 3.2 Gen 1
Expansion Ports
1 (for Synology RX1225RP)
Form Factor
Rackmount 3U
Dimensions (H x W x D)
132.3 mm x 482 mm x 656.5 mm
Weight
17.3 kg
System Fans
3 x 80 mm
Power Supply
Redundant, AC 100–240V, 50/60 Hz, Single Phase
Operating Temperature
0°C to 35°C (32°F to 95°F)
Storage Temperature
-20°C to 60°C (-5°F to 140°F)
Relative Humidity
5% to 95% RH
Max Operating Altitude
5,000 m
Rack Installation
4-post 19″ rack (Synology Rail Kit RKS-02, sold separately)
Engineered for sustained operation in business-critical environments, the RS2825RP+ incorporates three hot-swappable fans for effective airflow and dual redundant power supplies to mitigate downtime during hardware failures. The hot-swappable drive trays support online volume management, allowing for drive replacement or expansion without system shutdown. The power input is adaptable across 100–240V AC ranges, ensuring compatibility with global power standards. The system is further enhanced by a dedicated hardware encryption engine, allowing encrypted data processing without heavily impacting performance, making it practical for organizations handling sensitive or regulated data.
On the software side, the RS2825RP+ runs Synology’s DiskStation Manager (DSM), which supports a wide suite of data protection, business productivity, and infrastructure management applications. Included without additional licensing are tools such as Synology High Availability, which enables failover between identical units to ensure service continuity, and Snapshot Replication, which offers near-instantaneous recovery points for shared folders and LUNs. Hyper Backup extends protection to remote servers and public clouds with features like deduplication, data integrity verification, and multi-versioned backup scheduling. For IT environments reliant on virtualization, DSM integrates natively with VMware vSphere, Microsoft Hyper-V, Citrix, and OpenStack, with support for VMware VAAI and Windows ODX to offload and streamline storage operations.
Hyper Backup, Active Backup Suite (PCs, VMs, M365, Google Workspace)
High Availability
Supported (cluster with identical Synology NAS)
Surveillance Station
2 licenses included (up to 90 cameras supported with additional licenses)
Hybrid Share
Yes (C2 subscription required)
Synology Office
Up to 900 users
Synology Chat
Up to 300 users
Synology Drive
1,000 users / 15 million hosted files
MailPlus Server
5 accounts free (up to 1,100 with license packs)
SAN Manager
64 iSCSI Targets / 128 LUNs
VPN Server
12 concurrent connections
Security Features
Firewall, encrypted folders, SMB/FTP over TLS, HTTPS, Let’s Encrypt
Browser Support
Chrome, Firefox, Safari, Edge
Languages Supported
20+ including English, Français, Deutsch, 日本語, 简体中文, 한국어
Beyond infrastructure, DSM also serves as a collaboration platform. Synology Drive allows for real-time file synchronization across Windows, macOS, Linux, and mobile platforms, with granular permissions for enterprise-grade file governance. Users can collaborate using Synology Office, which provides a shared workspace for documents, spreadsheets, and presentations with unlimited versioning and cross-format compatibility. Communication features such as Synology Chat and Calendar are included, supporting encrypted messaging and team scheduling. Hybrid Share, an optional feature, combines on-premise access speed with cloud-based scalability, enabling multi-site deployments to efficiently manage shared files with a single global namespace.
The RS2825RP+ supports a maximum of 28 drives when paired with the RX1225RP expansion unit, enabling up to 560 TB of raw storage using currently available 20 TB drives. Storage flexibility is provided through support for Btrfs on internal volumes and a range of file systems on external devices. Multiple RAID configurations are available, including Synology Hybrid RAID, Basic, JBOD, and traditional RAID levels 0 through 10. SSD caching is supported via both SATA and M.2 NVMe SSDs, the latter requiring optional expansion cards. Volume sizes up to 200 TB are supported, although configurations exceeding 108 TB require the system to be upgraded to 32 GB of RAM, ensuring memory availability for managing large metadata and file tables.
A key constraint with the RS2825RP+ is Synology’s enforcement of verified drive compatibility. At the time of release, the system only allows initialization and full access to features when Synology-branded drives or those listed on its official compatibility list are installed. This closed ecosystem policy may limit adoption among users seeking to repurpose third-party or existing storage media. The restriction also affects advanced features such as SSD caching, drive health monitoring, and hybrid volume configurations, which are tied to Synology’s drive firmware and integration layers. The Synology RS2825RP+ offers a balanced mix of compute power, storage expandability, and data protection features suitable for centralized IT infrastructure in small to medium-sized businesses. Its high-speed throughput, enterprise-grade software suite, and support for virtualization and surveillance make it versatile for multiple deployment scenarios. However, organizations considering this model should weigh the implications of Synology’s drive compatibility enforcement against their existing hardware procurement policies.
Synology RS2825RP+ vs RS2821RP+ – A Significant Upgrade?
he RS2825RP+ is expected to replace the older RS2821RP+ in Synology’s 16-bay rackmount NAS lineup, and while both systems share the same 3U chassis size, drive bay count, and expansion support up to 28 bays, they diverge significantly in internal hardware. The newer model features a faster AMD Ryzen V1780B CPU with a higher base clock of 3.35 GHz (vs 2.2 GHz in the V1500B), along with 8 GB of ECC DDR4 memory pre-installed—double that of the RS2821RP+. The RS2825RP+ also includes a 10GbE port by default, something absent from the RS2821RP+, which instead comes with four 1GbE ports. While both models support PCIe expansion, the RS2825RP+ uses a newer generation processor with improved encryption offloading and virtualization potential, better suited to modern business applications with higher throughput demands.
However, the RS2821RP+ offers greater flexibility in terms of supported drive media. Although Synology recommends its own branded drives for this unit, it does not enforce the same strict hardware lock-in seen on the RS2825RP+. Users of the RS2821RP+ can utilize a broader range of 2.5” and 3.5” SATA HDDs and SSDs, including many from third-party vendors, without encountering initialization blocks or feature restrictions. This openness makes the RS2821RP+ a more attractive option for businesses with existing storage investments or those who prioritize long-term cost control and vendor neutrality. By contrast, the RS2825RP+ requires verified drives at launch, which restricts hardware reusability and may increase TCO for those transitioning from legacy systems.
When Will the Synology RS2825RP+ Be Released and the Price?
Ultimately, the RS2825RP+ represents a forward step in terms of raw performance and integrated networking capabilities, aligning with Synology’s broader push toward all-in-one systems with deeper integration and control. But that progress comes at the cost of flexibility, particularly in storage media compatibility. The RS2821RP+ may remain relevant for users seeking broader hardware compatibility, even as the RS2825RP+ replaces it in the official portfolio. Buyers will need to weigh the advantages of newer hardware against the limitations introduced by Synology’s tighter ecosystem approach.
All shared information online and inadvertent slips on the RS2825RP+ appear to indicate that the RS2825RP+ will arrive at a similar price point to it’s predecessor at around $3000-3499, and launching earlier in the eastern regions, but eventually rolling out globally in June.
Check Amazon in Your Region for the Synology RS2825RP+ NAS
This description contains links to Amazon. These links will take you to some of the products mentioned in today's content. As an Amazon Associate, I earn from qualifying purchases. Visit the NASCompares Deal Finder to find the best place to buy this device in your region, based on Service, Support and Reputation - Just Search for your NAS Drive in the Box Below
Need Advice on Data Storage from an Expert?
Finally, for free advice about your setup, just leave a message in the comments below here at NASCompares.com and we will get back to you.Need Help?
Where possible (and where appropriate) please provide as much information about your requirements, as then I can arrange the best answer and solution to your needs. Do not worry about your e-mail address being required, it will NOT be used in a mailing list and will NOT be used in any way other than to respond to your enquiry.
[contact-form-7]
TRY CHAT Terms and Conditions
If you like this service, please consider supporting us.
We use affiliate links on the blog allowing NAScompares information and advice service to be free of charge to you.Anything you purchase on the day you click on our links will generate a small commission which isused to run the website. Here is a link for Amazon and B&H.You can also get me a Ko-fi or old school Paypal. Thanks!To find out more about how to support this advice service checkHEREIf you need to fix or configure a NAS, check FiverHave you thought about helping others with your knowledge? Find Instructions Here
Or support us by using our affiliate links on Amazon UK and Amazon US
Alternatively, why not ask me on the ASK NASCompares forum, by clicking the button below. This is a community hub that serves as a place that I can answer your question, chew the fat, share new release information and even get corrections posted. I will always get around to answering ALL queries, but as a one-man operation, I cannot promise speed! So by sharing your query in the ASK NASCompares section below, you can get a better range of solutions and suggestions, alongside my own.
If you like this service, please consider supporting us. We use affiliate links on the blog allowing NAScompares information and advice service to be free of charge to you.Anything you purchase on the day you click on our links will generate a small commission which isused to run the website. Here is a link for Amazon and B&H.You can also get me a Ko-fi or old school Paypal. Thanks!To find out more about how to support this advice service checkHEREIf you need to fix or configure a NAS, check FiverHave you thought about helping others with your knowledge? Find Instructions Here
Connexion
