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The Synology RS1626xs+ is a 1U 4 bay rackmount NAS aimed at business and enterprise environments that need high performance in a short-depth footprint. It succeeds the RS1619xs+ after a notably long refresh gap and introduces a more modern hardware platform, including a newer Intel Xeon D processor, 16 GB of ECC memory as standard, dual 10GbE networking, integrated M.2 NVMe slots, and PCIe Gen4 expansion. On paper, this is a more substantial update than some recent Synology refreshes, particularly in areas that affect throughput, caching, and expansion flexibility. At the same time, the RS1626xs+ arrives within the current Synology enterprise strategy, which places tighter control around validated components and supported media. That means the hardware changes need to be considered alongside platform restrictions, expected pricing movement, and the wider value proposition of DSM in the business rackmount market. As a result, the RS1626xs+ looks positioned as a compact but capable SMB and enterprise rack NAS, though its appeal will likely depend as much on Synology’s ecosystem policies as on the hardware itself.
Synology RS1626xs+ Hardware Specifications
At the core of the RS1626xs+ is an Intel Xeon D-1726 processor, a 6-core, 12-thread CPU with a 2.9 GHz base clock and up to 3.5 GHz turbo. This is a clear step up from the previous generation Xeon D-1527 found in the RS1619xs+, increasing both core count and clock speed. Although it is not the newest server CPU architecture available in 2026, it is a more current platform than its predecessor and brings PCIe Gen4 support, which has a direct effect on overall system bandwidth for expansions and attached components.
Memory has also been increased, with the RS1626xs+ arriving with 16 GB of DDR4 ECC RDIMM as standard across 4 memory slots, with support for up to 64 GB total. That doubles the default memory provision of the older model and should better align with virtualization, backup indexing, active collaboration workloads, and larger multi-service deployments in DSM. Synology continues to recommend its own validated memory for upgrades, and as with other current business systems in its portfolio, warranty and support are tied closely to approved components.
In terms of storage, the system retains a 4 bay SATA drive architecture and supports expansion up to 16 total bays through the RX1225RP expansion unit. Alongside the main bays, Synology has included 2 internal M.2 2280 NVMe slots for SSD caching without consuming the PCIe expansion slot or front storage bays. This allows the RS1626xs+ to support flash-assisted performance acceleration out of the box, while preserving the rear PCIe slot for network or storage upgrades. Official support covers 3.5-inch SATA HDDs, 2.5-inch SATA SSDs, and M.2 NVMe SSDs, though deployment flexibility will still depend on Synology’s compatibility policies.
Networking is one of the more significant changes in this generation. The RS1626xs+ includes 2 built-in 10GbE RJ-45 ports, compared with the 4 x 1GbE arrangement of the RS1619xs+. There is also a dedicated out-of-band management port, 2 USB 3.2 Gen 1 ports, and a Mini-SAS HD expansion connector for the external shelf. For additional connectivity, the system includes 1 PCIe Gen4 x8 slot that can be used for 10GbE, 25GbE, or Fibre Channel upgrades, giving it more flexibility for storage networks and higher-bandwidth business environments than the previous model’s Gen3 slot.
Physically, the RS1626xs+ remains a 1U rack system but is notably deeper and heavier than the older unit, measuring 44 x 481.9 x 668.5 mm and weighing 9.5 kg. It also moves to a 250 W redundant power design, compared with the earlier 150 W arrangement, which reflects the higher performance profile and expanded integrated feature set. Synology rates the unit at 97.59 W during access and 56.19 W during HDD hibernation, with a quoted noise level of 52.6 dB(A). Cooling is handled by 4 x 40 mm fans, and the system includes standard enterprise features such as dual hot-swappable PSUs, scheduled power controls, auto-restart after power loss, and a 5-year warranty.
Synology RS1626xs+ Software Specifications
On the software side, the RS1626xs+ is positioned as a full DSM business platform rather than a storage-only rackmount. It supports up to 32 storage pools, a maximum single volume size of 108 TB by default, 200 TB with at least 32 GB of memory, and up to 1 PB in specific RAID 6 configurations with 64 GB of memory. Supported RAID modes include Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, and RAID F1, with SSD read/write cache and SSD TRIM also supported. File system support includes Btrfs internally, with a broad range of external file systems and network protocols including SMB, NFS, FTP, WebDAV, Rsync, iSCSI, and Fibre Channel.
DSM on this platform is also designed to support heavier service consolidation. Synology rates the RS1626xs+ for up to 1,900 SMB connections, 2,048 local user accounts, 512 shared folders, and 12 shared folder sync tasks. In application terms, the system is listed with support for up to 3,100 Synology Drive users, 3,000 Synology Office users, 3,600 MailPlus users, and 400 Synology Chat users, depending on memory configuration and workload type. Virtualization support includes VMware vSphere, Microsoft Hyper-V, Citrix XenServer, and OpenStack, while Virtual Machine Manager is rated for 12 virtual machines and 12 Virtual DSM instances.
Beyond file serving, the RS1626xs+ includes Synology’s wider business software stack for backup, surveillance, synchronization, and centralized administration. It supports Synology High Availability, Hyper Backup, Active Backup workloads, Snapshot Replication with up to 4,096 system snapshots, SAN Manager with up to 256 iSCSI targets and 512 LUNs, and Surveillance Station with 2 camera licenses included and support for up to 75 IP cameras at 1080p. Synology also positions the platform for hybrid cloud workflows, centralized fleet management through CMS and Active Insight, and newer AI-assisted functions within its collaboration suite, making the RS1626xs+ a software-heavy platform where DSM remains a major part of the system’s overall value.
Category
Specification
OS
DSM
Max Volume Size
108 TB, 200 TB with 32 GB RAM, up to 1 PB with 64 GB RAM and RAID 6
Max Storage Pools / Volumes
32
RAID Support
Basic, JBOD, RAID 0, 1, 5, 6, 10, F1
SSD Features
Read/write cache, TRIM
Internal File System
Btrfs
External File Systems
Btrfs, ext4, ext3, FAT32, NTFS, HFS+, exFAT
File Protocols
SMB, AFP, NFS, FTP, WebDAV, Rsync
Max SMB Connections
1,900
User / Folder Limits
2,048 users, 512 groups, 512 shared folders
Shared Folder Sync Tasks
12
Hybrid Share Folder Limit
15
High Availability
Yes
Hyper Backup
Yes
Snapshot Replication
256 snapshots per shared folder, 64 per LUN, 4,096 per system
Third-party AI model integration, de-identification up to 1,700 words
Synology RS1626xs+ vs RS1619xs+ NAS
Compared with the RS1619xs+, the RS1626xs+ is a more substantial hardware refresh than the model gap alone might suggest. The older system used an Intel Xeon D-1527, a 4-core, 8-thread processor running at 2.2 GHz base and 2.7 GHz turbo, whereas the RS1626xs+ moves to a Xeon D-1726 with 6 cores, 12 threads, 2.9 GHz base, and 3.5 GHz turbo. The newer model also doubles the default memory from 8 GB DDR4 ECC UDIMM to 16 GB DDR4 ECC RDIMM, while retaining the same 64 GB maximum ceiling across 4 slots. At the platform level, the move from PCIe Gen3 x8 to PCIe Gen4 x8 is also relevant, as it increases available expansion bandwidth for modern network or storage upgrades.
The networking and storage configuration also show a clearer shift in priorities. The RS1619xs+ arrived with 4 x 1GbE ports and required expansion for faster networking, whereas the RS1626xs+ includes 2 x 10GbE RJ-45 ports as standard, alongside a dedicated management port. Both systems support expansion to 16 bays with a 1 unit expansion shelf and both include 2 M.2 slots, but the RS1626xs+ is more focused on NVMe caching with integrated flash support alongside newer expansion options such as 10GbE, 25GbE, and Fibre Channel via the Gen4 slot. In practical terms, the newer system is much better aligned with modern high-throughput business environments straight out of the box.
That said, the RS1626xs+ is not an across-the-board improvement in every operational metric. It is larger, deeper, heavier, and significantly noisier on paper, moving from 518.6 mm depth and 39.3 dB(A) on the RS1619xs+ to 668.5 mm depth and 52.6 dB(A) on the newer model. Power consumption is also higher, rising from 68.68 W active usage on the older unit to 97.59 W on the newer platform. So while the RS1626xs+ is clearly the more capable and modern system in CPU, networking, memory, and expansion, it also reflects a more demanding enterprise profile in acoustics, power draw, and likely total deployment cost.
Category
Synology RS1626xs+
Synology RS1619xs+
CPU
Intel Xeon D-1726
Intel Xeon D-1527
CPU Cores / Threads
6 cores / 12 threads
4 cores / 8 threads
CPU Clock Speed
2.9 GHz base / 3.5 GHz turbo
2.2 GHz base / 2.7 GHz turbo
Architecture
64-bit
64-bit
Hardware Encryption
Yes
Yes
Default Memory
16 GB DDR4 ECC RDIMM
8 GB DDR4 ECC UDIMM
Memory Slots
4
4
Maximum Memory
64 GB
64 GB
Drive Bays
4
4
Maximum Bays with Expansion
16
16
Expansion Unit
RX1225RP
RX1217 / RX1217RP
M.2 Slots
2 x NVMe
2 x NVMe / SATA
Supported Drives
3.5″ SATA HDD, 2.5″ SATA SSD, M.2 NVMe SSD
3.5″ SATA HDD, 2.5″ SATA HDD, 2.5″ SATA SSD, M.2 NVMe / SATA SSD
Hot Swap Support
Yes
Yes
Built-in Network Ports
2 x 10GbE RJ-45
4 x 1GbE RJ-45
Management Port
1 x out-of-band management port
No dedicated management port listed
USB Ports
2 x USB 3.2 Gen 1
2 x USB 3.2 Gen 1
Expansion Port
1 x Mini-SAS HD
1 x Infiniband
PCIe Slot
1 x PCIe Gen4 x8
1 x PCIe Gen3 x8
Form Factor
1U rackmount
1U rackmount
Dimensions
44 x 481.9 x 668.5 mm
44 x 480 x 518.6 mm
Weight
9.5 kg
8.16 kg
System Fans
4 x 40 mm
2 x 40 mm
Fan Modes
Full speed, low temperature, silent
Full-speed, cool, quiet
Noise Level
52.6 dB(A)
39.3 dB(A)
Power Supply
250 W
150 W
Redundant PSU
Yes
Yes
Power Consumption
97.59 W access / 56.19 W hibernation
68.68 W access / 34.78 W hibernation
Operating Temperature
5°C to 35°C
5°C to 35°C
Warranty
5 years
5 years
Synology RS1626xs+ Price and Release
At the time of writing, Synology has revealed the RS1626xs+ on regional product pages, but wider global availability still appears to be pending. The system has already appeared in official marketing materials and product specification pages, indicating that the hardware and software position are now largely defined, even if retail rollout is not yet universal across all regions. Based on that, the RS1626xs+ should be treated as officially revealed, but not yet fully launched in every market. Release timing is notable because the RS1626xs+ arrives after a long gap following the RS1619xs+, which was introduced in the 2018 to 2019 period. That makes this a delayed but more meaningful refresh than some of Synology’s shorter product cycles, particularly given the changes to CPU generation, default memory, built-in networking, PCIe bandwidth, and integrated NVMe support. It is therefore not simply a minor refresh of the previous 1U 4 bay platform, even if the overall product class remains the same.
Pricing has not yet been formally confirmed in the materials provided, so any figure at this stage remains estimate rather than specification. The earlier RS1619xs+ was commonly seen around the $2,400 range earlier in its lifecycle, but later pricing in some regions moved closer to or above $3,000. Given the RS1626xs+ includes 16 GB ECC memory as standard, dual 10GbE onboard, a newer Xeon D platform, PCIe Gen4, and redundant 250 W power supplies, it would be reasonable to expect a higher launch price than its predecessor rather than price parity. The main issue for buyers will likely be total platform cost rather than base chassis cost alone. This system is aimed at business and enterprise deployment, and that means the final spend may also include validated Synology drives, NVMe media, memory upgrades, rail kits, network cards, and the RX1225RP expansion shelf where needed. Until Synology confirms full regional rollout and channel pricing, the RS1626xs+ should be viewed as a higher-tier compact rackmount NAS with an expected premium position in the current RackStation portfolio.
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