Synology DS423+ vs DS923+ Plex NAS Comparison – Which Should You Buy?

Today I want to compare the hardware on offer inside the Synology DS923+ NAS (released in Dec 2022) and compare it with the newer and more lower powered, but hugely popular Synology DS423+ NAS (released inin Summer 2023). However, unlike previous comparisons of these two NAS (such as the hardware and software comparison HERE that I published a few months ago) today I want to compare how the DS423+ and DS923+ perform as a Plex Media Server, with a series of 720p, 1080p and 4K tests. I have already tested these two NAS devices individually, but never directly compared their performance side by side. Now that a number of prominent Synology NAS releases have arrived with AMD Ryzeen embedded processors (such as the AMD Ryzen R1600 and V1500), many are wondering if they should choose to buy the older and more affordable Synology NAS drives that still feature Intel embedded/integrated graphics, such as the DS423+ with it’s J4125 Celeron CPU. So, let’s get this test up and running. First, we need to take a quick look at the individual hardware of these two NAS devices.

Synology DS423+ NAS	Synology DS923+ NAS

Synology DS423+ vs DS923+ Plex NAS Comparison – Internal Hardware

These 4-Bay Diskstation releases from Synology have always been one of the most interesting tiers of the brand’s desktop solutions. The reason for this is that all too often this scale of system serves as a bridging point between Prosumer & SOHO systems and the small/medium business hardware in their portfolio. This is demonstrated first in the scale of the available RAID 5/6 storage, but then more so in the scalability and upgradability of these two volumes system, allowing an expansion, greater network connectivity (arriving with 2x LAN ports) and better internal hardware than the more domestic targetted solutions – often with the internal hardware differing considerably between each periodic 2-3yr refresh by the brand. Let’s first look at the internal hardware of these two NAS’ to see how much they differ. The DS423+ NAS first arrived on the scene with some great hardware advantages over the rest of the plus series 2023/2024 systems (DS223, DS124, etc), arriving with a 4 Core Intel Celeron Processor that featured integrated graphics, 4GB of DDR4 2666Mhz memory and NVMe SSD upgrade slots. In the 3-4 years since this hardware configuration was firt released though (the DS920+/DS720+ released in summer 2020), Synology clearly decided to make some big changes in the base level architecture of the plus series and specifically in the DS923+ to make it considerably more scalable and general business/file-ops focused. The newer DS923+ features a dual-core AMD Ryzen embedded R1600 that, although arriving with half the cores of the Celeron in the DS423+, has a higher CPU frequency and total achievable frequency in turbo/burst when needed. That said, users will be surprised to learn that this CPU also does not feature embedded graphics, so therefore the DS923+ will be less CPU efficient at handling multimedia or VM deployment than the DS423+.

Though both systems feature DDR4 memory, the DS423’s maximum 8GB of memory is beaten by the DS923+ thanks to its use of much more impressive ECC (error code correction) memory to identify and repair any bit level write errors and can also be scaled to a considerably higher 32GB of memory (arriving with 8GB by default).

NAS Model	DS423+	DS923+
CPU Model	Intel Celeron J4125	AMD Ryzen R1600
CPU Quantity	1	Embedded Ryzen
CPU Architecture	64-bit	64-bit
CPU Frequency	4-core 2.0 – 2.7 GHz	2-core 2.6 – 3.1 GHz
Hardware Encryption Engine (AES-NI)	Yes	Yes
Integrated Graphics	Yes	No
CPU Cache	4 MB cache	1 MB L2 cache, 4 MB L3 cache
Memory
System Memory	4GB DDR4 non-ECC SODIMM	4GB DDR4 ECC SODIMM
Memory Module Pre-installed	(4GB On-board)	4 GB (4GB x 1)
TDP	10W	25W
Total Memory Slots	1	2
Maximum Memory Capacity	8GB	32 GB (16 GB x 2)
System Fan	92 mm x 92 mm x 2 pcs	92 mm x 92 mm x 2 pcs
Power Supply Unit / Adapter	65W External	90W External

You can find out more about the hardware-specific difference between the Synology DS423+ and DS923+ NAS in the video below OR via the article HERE. This video/article coves everything from the storage capabilities, ports & connections and extent to which they run/perform in DSM 7.1. Although this article is specifically tailored to look at Plex Media Server performance, I would strongly recommend checking out more information on either of these NAS before you make any decision.

Let’s carry on talking about these two NAS and Plex. What difference des the TYPE of media tha you play make on how these two NAS perform in Plex?

Synology DS423+ vs DS923+ Plex NAS Comparison – Understanding MEDIA!

Important Terms to Understand in Plex/NAS/Multimedia that will make the DS923+ or DS423+ NAS Plex Tests Easier to Understand.

• SD, 160p, 240p, 480p, 720p, 1080p, 4K : This is the resolution that the media is being displayed at. The higher the resolution, the larger number of pixels that are available and depending on the original recording quality of the media in question. High resolutions, such as 1080p and 4K require more work to be done by the NAS hardware in order to playback the file. More often than not, a NAS with weak embedded graphics or no embedded graphics at all will be unable to play 4K very well or indeed at all. It is important to remember that just because a NAS brand like Synology says that their latest NAS can natively play back 1080p or 4K media (natively = played using their own NAS software, software client tools and/or DLNA), that does not mean that the DS423+ or DS923+ will play to the same standard in Plex, as Plex is a 3rd party tool
• Transcoding, Encoding, Decoding : These are all different techniques/names for when a file needs to be changed in order to be better suited to the connected client device connection, strength or hardware. If you are accessing all your media on the local area network (i.e only accessing your plex media at home), then transcoding will rarely be something you will use (unless your media is largely H.265/HEVC based, see earlier). However, perhaps you are accessing your plex library on the train to work or from a sun bed whilst on holiday. Perhaps you have a smaller data bandwidth/allowed MB/GB, maybe a weaker internet connection, perhaps you are using a smaller phone device and you might not need to watch your 4K 50GB Blu-ray rip of the latest Marvel Movie – in these situations, you might well want to access the media on your Synology DS923+ or DS423+ Plex NAS at a lesser quality than the original version, so transcoding/re-encoding on the fly (as in, at the same time it is being played) is what you would want to do. Remember, transcoding is by far the most heavy-weight thing you will need to do on a NAS. It is also worth remembering that in order for Plex o be able to use the FULL resources of a NAS CPU (such as embedded graphics) that you will need to enable ‘Make My CPU Hurt’ in the Encoder Menu of the Plex NAS Settings menu – this also potentially requires a Plex Pass subscription, depending on the NAS in question

 

• H.264, HEVC, H.265 :  These are compression techniques that are designed to allow large-scale media presentations that were made for a cinema to be viewable from your sofa (with H.265 being the more effective/powerful compression level). H.264 can largely be played by ALL devices, but many devices do not have permission or a license to play H.265/HEVC (they are the same thing). This is because, where H.264 is an easy license and comparatively free to use, H.265/HEVC licencing and patents are spread across multiple providers and allowing a device license to use this compression technique can be complex, expensive or simply impossible. Therefore HEVC/H.265 media will sometimes AUTOMATICALLY need to be converted/transcoded into H.264 etc in order to be played – therefore eating up more system resources. The DS923+, much like the rest of the Synology NAS range do not arrive with HEVC support by default
• Bitrate : Bitrate is the amount of data encoded for a unit of time, and for streaming is usually referenced in megabits per second (Mbps) for video, and in kilobits per second (kbps) for audio. Higher quality and higher resolution media tends to be of a much higher bitrate

For more information on the most important terms to understand when discussing/researching a NAS as a Plex Media Server can be found in my video below:

Any further questions, you can use the free advice section at the bottom of the page and ask me and Eddie directly.

Synology DS423+ vs DS923+ Plex NAS Comparison – 720p h.264 3Mbps Video File

The first test was with a very low-end 720p media file:

Virtually no difference in performance and you can likely play a considerable number of these files before the system shows even a hint of difficulty.

Synology DS423+ vs DS923+ Plex NAS Comparison – 720p h.264 3Mbps Video File

Another 720p file for test two, similar bitrate to test 1:

Once again, both the DS423+ and DS923+ NAS performed near identically in Plex and zero issues were seen.

Synology DS423+ vs DS923+ Plex NAS Comparison – 720p h.264 3Mbps Video File CONVERT to 480p

Test three was our first transcoding/encoding test. Here I wanted to see how well the systems would cope with having a fle format/playback altered on the fly. If you are watching media on smaller devices, over limited internet connections or using a legacy client device that does not support the file format, compression, codec or scale (size), then transocding is going to be very important. This was 720p down to 480p

Both played the file and transcoded it very easily. Despite the lack of embedded graphics on the R1600 CPU inside the Synology DS923+ versus the Intel J4125 Celeron inside the DS423+, things were great on both in this test.

Synology DS423+ vs DS923+ Plex NAS Comparison – 720p h.264 3Mbps Video File CONVERT to 240p

Time for ANOTHER transcoding test, but this one was s much bigger and more extreme transcode/encode. I wanted to change a 720p file to a 240p file format. This is a pretty aggressive change and one that was mainly picked to simulate heavy Plex NAS use generally (not specific to this format of file/change).

This was the first (and not last) time that the clear advantage of an embedded graphics Intel Celeron CPU inside the DS423+ would prove much more effective in Plex versus the AMD embedded Ryzen R1600 CPU inside the DS923+ NAS. Both NAS devices did the job, but the R1600 / DS923+ had to work much, much hardware with software transcoding and raw power.

Synology DS423+ vs DS923+ Plex NAS Comparison – 1080p h.264 3Mbps Video File

On to 1080p Plex Tests on the DS423+ and DS923+ NAS. This was a fairly domestic HD 1080p file test, played native.

Once again, like the early 720p tests, the DS423+ and DS923+ performed perfectly well.

Synology DS423+ vs DS923+ Plex NAS Comparison – 1080p h.264 3Mbps

A slightly more dense 1080p file this time, using the Jellyfish test files.

Once again, very clear and even performance by both NAS systems in the 1080p 2nd test without any transcoding on the R1600 and J4125 CPU-powered devices. A clear draw.

Synology DS423+ vs DS923+ Plex NAS Comparison – 1080p h.264 3Mbps Video File CONVERT to 160p

Time for more transcoding! Transcoding/re-encoding the 1080p file in Plex to an incredibly lowly 160p. Again, I am aware that few users will actually watch 160p, but many will want this support for audio media equivalent workload and/or for large numbers of streams. Ultimately, we want to know the impact on the DS923+ and DS423+ NAS in plex with these.

Once again, the onboard/embedded graphics that the Synology DS423+ (Intel Celeron J4125) has over the non-integrated graphics DS923+ (AMD R1600) clearly resulted in the older 4-Bay NAS getting this job done with very little fuss. Whereas the Neewer 5-Bay NAS was unable to complete the task.

Synology DS423+ vs DS923+ Plex NAS Comparison – 1080p h.264 100Mbps

Switching things up to an incredibly DENSE 1080p file, I selected the 100Mbps file format (h.264) to see how the DS923+ and DS423+ would play this natively.

Very similar results on both NAS playing the file natively, which was very positive. The DS923+ used the tiniest bit more, but in the grand scheme of things, both of these NAS performed exceptionally well in Plex and this heavy-duty 1080P FILE.

Synology DS423+ vs DS923+ Plex NAS Comparison – 1080p h.265 – HEVC 10bit 10Mbps

Now we move towards a very different ball game. Although the next test was a 10Mbps bitrate 1080p file (remember, the previous test was 10x this density), this time we selected the H.265 / HEVC 10bit file. As mentioned earlier, HEVC (highly efficient video codec) requires licensing by the client hardware manufacturer and software provider (with many/most not including it, relying on the hardware to convert the file to H.264 by default). HEVC is much more space efficient than H.264 and alot more media in 2022+ is arriving in this format. However, converting it (aka Transcoding by another name technically) is a demanding task. Here is how the DS423+ and DS923+ performed:

Once again, the Synology DS423+ and it’s Intel Celeron J4125 CPU got the job done with little-to-no fuss, whereas the AMD embedded Ryzen R1600 CPU inside the DS923+ immediately hit 100% CPU Utilization and failed (taking longer to convert the file per second than an actual second!).

Synology DS423+ vs DS923+ Plex NAS Comparison – 4K h.264 120Mbps

Next one, time for some 4K PLAYBACK! Now, it is worth highlighting that we ARE looking at quite high-end 4K media here, at 120Mbps – so the odds of you having much media in this format/scale is quite small. Still, 4K TVs and the affordability of 4K media is growing, so we need to test 4K, as well as scale it up for years to come. I wouldn’t normally recommend either of these NAS for 4K Plex use (recommending at least an Intel Pentium, i3 or higher generally), but here is how they performed:

Yep, both NAS devices failed. But again, remember that this is a 120Mbps file. Had we tested 4K at the bitrate of many of the 1080p files, it would have been better. We have some 4K dedicated Plex content coming soon on these NAS devices, so stay tuned!

Synology DS423+ vs DS923+ Plex NAS Comparison – 4K h.265 – HEVC 120Mbps

Next we tested the same dense 120Mbps 4K files as before, but in the HEVC version. Again, due to the support of this compression level on each of these Synology NAS being limited, converting the file was needed by default. Here is how the DS423+ and DS923+ NAS performed.

Yep, thanks to the introduction of converting the 4K file being needed, the embedded graphics of the DS423+ CPU saved the day hugely and the result was that although it played (after a small delay) on the Intel-powered DS423+, the DS923+ and ADM Ryzen hit a wall very quickly.

Synology DS423+ vs DS923+ Plex NAS Comparison – 4K h.265 – HEVC 200Mbps

Our final test was a 4K file in HEVC, much like the previous test. However this was a HENCH 200Mbps – a herculean task compared with all other tests in this article. Here is the DS423+ and DS923+ tackled the task.

Yep, once again, that Intel J4125 Celeron CPU and it’s integrated graphics was able to get the converting/encoding done on the fly and win here. The AMD embedded Ryzen R1600 COULD have off-line transcoded for sure, but when it came on on-the-fly conversions, it just lacked the right tools on board. Want to watch more tests on either of these NAS drives IN PLEX? You can visit the links below to view the individual Plex Media Server tests for each of the DS423+ and DS923+ NAS. These videos and articles include several more tests and go into more detail on the difference between H.264 and H.265/HEVC media, as well as further 1080p and 4K testing:

Written Plex Test Articles	YouTube Plex NAS Test Videos

Synology DS423+ vs DS923+ NAS – Conclusion and Verdict

Comparing the DS423+ from 2023 and DS923+ from late 2022 did seem a little unfair at first, as ALOT can happen in 1.5 years (technology moves FAST!). However, in terms of supporting multimedia, if you are looking at these two NAS drives SPECIFICALLY for Plex Media Server and Multimedia use, the older generation device with its Intel embedded graphics CPU just wins the day over the Embedded Ryzen R1600 from AMD. But either of these NAS devices presents a decent-sized financial investment and I think most users need to think about using them for MORE than just multimedia. Synology has clearly done a lot of thinking in the two years between the release of the DS423+ and DS923+, deciding to change the latter into something more ‘business-y’. When the DS423+ first arrived, it did so to mixed responses (Still 1GbE, an Intel Celeron but an older revision) and it has pretty much always been in the top 5 NAS since its launch for most users in terms of price and ability. Those with longer memories will know that the Diskstation portfolio used to be largely dominated by very much this kind of hardware architecture (i.e a file transfer focused CPU, more memory scaling, optional 10GbE, etc) and rather than building off the design of the 4-Bay DS920+ that came before it, the DS923+ seems to scale itself against the DS1621+. DS1821+ and more in it’s shape and abilities. If you were already looking at Synology NAS systems that being a heavy emphasis on scaling their architecture notably down the line in efforts to remain future proof, the DS923+ is going to tick ALOT of boxes for you. Whereas if you were looking at a Synology NAS for home use, a Plex Media server, low client/user use and generally as more of a setup-and-forget solution, then the DS423+ will likely suit your needs better and will have the added benefit of a more palatable price point in 2022. How far Synology will extend the build logic of the DS923+ towards other solutions in the diskstation/rackstation portfolio still remains to be seen. Most business users will want to opt for the DS923+ though. Cheers for reading!

NAS MODEL ID	Synology DS423+ NAS	Synology DS923+ NAS
Where to Buy:

 

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