Synology DS1621+ vs DS1621xs+ NAS Comparison

Synology DS1621+ vs DS1621xs+ NAS Drive – Which Should You Buy?

Right now, if you wanted to buy a Synology Desktop NAS for RAID 6, you are a bit spoilt for choice. The growing popularity and viability of RAID 6 as a configuration (i.e having 2 drives of failure protection) has become far more acceptable thanks to hard drives getting larger and larger in capacity. With modern NAS hard drives, such as the Seagate Ironwolf and WD Red arrive can now arriving in 16TB and 18TB, you can now comfortably accommodate a RAID 6 environment and still have a remarkably large amount of available storage. Alongside this, the performance benefits of RAID 5 and RAID 6 are far higher than they have ever been, with increased improvements in data handling internally, so many users are able to get more compact RAID systems that can accommodate a handful of drives, whilst still achieving high speed and a good level of drive redundancy. Into this current trend for storage, Synology has recently released two 6-Bay Solutions in their popular Diskstation desktop series, the Synology DS1621xs+ NAS in September and the DS1621+ NAS in October of 2020. The former a much more enterprise-grade product that provides robust storage, surrounded by higher-end hardware, services and support, whereas the latter is a much more Sall/Medium (SMB) solution that finds a much more balanced hardware vs price point level in its architecture that allows users to have a similar level of storage potential, with the services and support trimmed back slightly. Each has its own advantages and disadvantages, with very distinct end-users in mind (business and prosumers alike), so which one should you buy? Let’s find out today which one deserves your data!

Synology DS1621+ vs DS1621xs+ NAS – Price and Value

Probably the first big roadblock for many buyers when choosing between the DS1621+ and DS1621xs+ NAS will be the difference in price, which is pretty substantial – almost double in fact! The Synology DS1621xs+ will cost you around £1300/$1650 without your local tax or hard drive (or SSD) media, a noticeable jump up from the £700/$850 or so for the Synology DS1621+. If you are already on the top end of your budget or are looking to spend more money of storage media (i.e MORE terabytes) then it will seem pretty crazy to spend so much more money on another NAS that seems so similar in architecture (6 Bays, 4-Core CPU, DDR4 Memory, PCIe upgrade, DSM, BTRFS, etc). But we need to move away slightly from the subject of ‘price/cost’ and more towards Value to understand this big price difference.

The Synology DS1621xs+ has a number of upgrades and standalone extras when compared with the DS1621+ that, once you calculate them, really do start to make up that price difference. Maybe not completely, but certainly, they make a case for the extra cost. Examples such as the Xeon Quad-Core processor in the DS1621xs+ being more powerful and capable than the Ryzen V1500B, or the 8GB of DDR4 memory in the XS unit over the 4GB in the DS1621+, as well as the 5yr warranty vs the 3yr warranty on the DS1621+. Finally, there is the fact that although both units can have their storage expanded, the DS1621xs+ has the 10Gbe connection by default, which allows further expandability in its connections down the line. It is STILL a big, big price difference and technically if you costed the CPU difference, the extra 4GB RAM, the 2yrs warranty and 10Gbe as standard it might make up the price difference, but if you do not plan on using ANY (or even most) of these features and services in the lifespan of the product, then the DS1621+ is still the better price choice.

Result – You Should Buy the Synology DS1621+ NAS As It Is More Affordable, But DS1621xs+ Is Better Value

Synology DS1621+ vs DS1621xs+ NAS – Design

Design is so, SO slim a distinction between the DS1621xs+ and DS1621+ that you can hardly see the difference physically. Aside from a slight rearrangement of the ports (the facilitate the difference in external network architecture) they are near enough identical!

Synology DS1621XS+ NAS Synology DS1621+ NAS

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Both systems use the same NVMe SSD installation slots inside the main SATA storage bay area, as well as the base twin SODIMM DDR4 Memory slots. They even arrive with the exact same internal 250W PSU slotted into the side of the chassis. The Synolgoy 6-Bay Diskstation chassis has been around now for just under 3years in units like the DS3018xs and DS1618+ before these two and it is still very nice to look at.

In fact, in the videos whereby I discussed the pros and cons between the DS1621+ and DS1621xs+, you can see the same hardware design and architecture points being raised. The only real areas where design can be separated is in terms of the heat generated, the power consumed and the weight of each chassis.

Ultimately, it is impossible to separate these two in terms of design.


Synology DS1621+ vs DS1621xs+ NAS – Hardware

This is where we can see the big, BIG difference between these two NAS devices. As mentioned above, the hardware difference is what makes up the big price difference between the DS1621+ and DS1621xs+. Below we can look at the main hardware specifications and I have highlighted in green the areas where one system is superior to the other.

Core Hardware


SYNOLOGY DS1621xs+ NAS Drive

Processor model AMD Ryzen V1500B Intel Xeon D-1527
Processor architecture 64-bit 64-bit
Processor clock 4-core 2.2 GHz 4-core 2.2 (base frequency) / 2.7 (maximum overclocking) GHz
Hardware encryption engine (AES-NI) YES YES
Pre-installed memory modules 4 GB (4 GB x 1) 8 GB (8 GB x 1)
Total memory slots 2 2
Maximum memory capacity 32 GB (16 GB x 2) 32 GB (16 GB x 2)
Storage device
Number of Disk Slots 6 6
Maximum number of disk bays for installing expansion units 16 (DX517 x 2) 16 (DX517 x 2)
M.2 disk bay 2 (NVMe) 2 (NVMe)
Compatible Disk Type
  • 3.5″ SATA HDD
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD
  • M.2 2280 NVMe SSD
  • 3.5″ SATA HDD
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD
  • M.2 2280 NVMe SSD
Maximum single storage capacity* 108 TB
  • 200 TB (32 GB memory required, only RAID 5 or RAID 6 groups supported)
  • 108 TB
Disk hot swap support YES YES
External port
RJ-45 1GbE network port 4 (Support Link Aggregation / Failover) 2 (Support Link Aggregation / Failover)
RJ-45 10GbE network port N/A 1
USB 3.0 port 3 3
eSATA port 2 2
PCIe expansion 1 x Gen3 x8 slot (x4 link) 1 x Gen3 x8 slot (x8 link)
Size (height X width X depth) 166 mm x 282 mm x 243 mm 166 mm x 282 mm x 243 mm
weight 5.1 kg 5.3 kg
other projects
System fan 92 mm x 92 mm x 2 pcs 92 mm x 92 mm x 2 pcs
Fan mode
  • Full speed mode
  • Low temperature mode
  • Silent mode
  • Full speed mode
  • Low temperature mode
  • Silent mode
Replaceable system fan YES YES
The front panel LED indicator can adjust the brightness YES YES
Automatic power recovery YES YES
Noise value* 25.2 dB(A) 25.2 dB(A)
Timer switch YES YES
Power supply/transformer 250 W 250 W
AC input voltage 100 V to 240 V AC 100 V to 240 V AC
Current frequency 50/60 Hz, single frequency 50/60 Hz, single frequency
Power consumption power* 51.22 W (Access)
25.27 W (HDD hibernation)
62.85 W (Access)
34.26 W (HDD Hibernation)
British Thermal Unit 174.77 BTU/hr (Access)
86.22 BTU/hr (HDD Hibernation)
214.45 BTU/hr (access)
116.89 BTU/hr (hard drive hibernation)
  • The power consumption test data is obtained when the Western Digital 1TB WD10EFRX hard drive is full.
  • Noise level test environment: Seagate 2TB ST2000VN000 hard disk is in standby mode, with two GRAS Type 40AE microphones set up at a distance of 1 meter from the front and back of Synology NAS; background noise level: 16.49-17.51 ​​dB(A); temperature: Celsius 24.25-25.75 degrees; humidity: 58.2-61.8%.
  • The power consumption test data is obtained when the Western Digital 1TB WD10EFRX hard drive is full.
  • Noise level test environment: Seagate 2TB ST2000VN000 hard disk is in standby mode, with two GRAS Type 40AE microphones set up at a distance of 1 meter from the front and back of Synology NAS; background noise level: 16.49-17.51 ​​dB(A); temperature: Celsius 24.25-25.75 degrees; humidity: 58.2-61.8%.
Warranty Hardware warranty for 3 years, which can be extended to 5 years coverage- EW201 5 years
Optional accessories
  • DDR4 ECC SODIMM: D4ES01-4G / D4ES01-8G / D4ECSO-2666-16G
  • Expansion device: DX517
  • 2.5″ SATA SSD: SAT5200
  • M.2 2280 NVMe SSD: SNV3400
  • 10GbE network interface card: E10G18-T2 / E10G18-T1 / E10G17-F2
  • VisualStation: VS960HD / VS360HD
  • Monitoring device authorization
  • DDR4 ECC SODIMM: D4ECSO-2666-16G
  • Expansion device: DX517
  • 2.5″ SATA SSD: SAT5200
  • M.2 2280 NVMe SSD: SNV3400
  • 10GbE network interface card: E10G18-T2 / E10G18-T1 / E10G17-F2
  • VisualStation: VS960HD / VS360HD
  • Monitoring device authorization

The Xeon CPU in the DS1621xs+ NAS, although not the newest generation and released earlier than the Ryzen V1500B in the DS1621+, has an identical main power level at 2.2Ghz, but can also be burst/clocked higher by the system as needed. This processor is far superior at file handling overall (although both are good) and will be the better choice for handling multiple tasks/users at any given time – a priority in enterprise/large business storage sectors. Both systems arrive with DDR4 2666Mhz error code correction (ECC) memory, but it should be highlighted that you get twice as much on day one in the DS1621xs+, which means more users, more VMs, more cameras for surveillance and better cache handling as your storage grows.

Then there is the inclusion of 10Gbe on the Synology DS1621xs+ as standard that is a real win here. Yes, the DS1621+ has 4 RJ45 1Gbe LAN ports that can be link aggregated (port trunked) to provide 4Gbe to a supported managed network switch (i.e. up to 440MB/s), but the DS1621xs+ still has 2x 1Gbe RJ45 along with the 1x 10GBASE-T (Copper) 10Gbe connection, allowing up to a potential 1220MB/s throughput to a supported 10Gbe managed switch (spread). Both systems have the PCIe Gen 3 x8 slot which allows the installation of 1-2 port 10Gbe ethernet upgrade cards, but that still means that both systems have the same expandability in that slot and therefore you will end up more beneficial in the DS1621xs+ overall. Finally, there is the fact both systems can have 2 storage expansions over eSATA, have the same 250W PSU and same M.2 NVMe SSD caching options. Despite them being the same architecture on those points, the CPU in the DS1621xs+ will just give you better top speeds in single and multiple simultaneous connections to the network, as well as use less resources whilst doing it – which means a hight overall number of processes possible.

Result – You Should Buy the Synology DS1621xs+ NAS

Synology DS1621+ vs DS1621xs+ NAS – Performance

As mentioned, the Synology DS1621xs+ has better hardware by default than the DS1621+, which means better performance vs resource use in most storage processes. The same goes for if yo uninstall a 10Gbe upgrade card that will add 1-2 more 10G connections to your network. The storage media you choose to install will, of course, make a big difference and dictate the top speed and how much you can saturate the external connections, but internally, the DS1621xs+ architecture will just do things quicker and allow more things to get done.

This can be applied to both first-party applications in the Synology DSM app centre (Surveillance, Virtual Machine Deployment, Photo/Video handling, the collaboration suite and multi-tiered backups with Hyper Backup and Active Backup in DSM), a well as how the hardware in the DS1621+ and DS1621xs+ can handle popular 3rd party applications like VMware, Hyper-V, Plex Media Server and more. Likewise, the 10Gbe connection available on Day 1 of the DS1621xs+ allows you to provide 1000MB/s (in the right RAID) to your network and thereby giving up to 10x 1Gbe connected users the FULL bandwidth they can handle.

Finally, that 8GB of memory on day one will make things super smooth in terms of application performance. If you plan on deploying the DS1621+ or DS1621xs+ for surveillance station in ou home or office environment, both support a similar level of cameras #s BUT you are going to eat up ALOT of memory to support more cameras! 8GB of memory at the start means even if you deploy 8-10 24×7 cameras at initialization, you still have a tonne of memory spare for virtual machines and the DSM system environment.

Click Below to find out where to download FREE NAS Virtual Machine Images and how to install them

Ultimately, the DS1621xs+ is just a better hardware package over the DS1621+ NAS and if you are choosing between them with Hardware as your driving demand, then the DS1621xs+ NAS wins.

Result – You Should Buy the Synology DS1621xs+ NAS As It Has Better Hardware

Synology DS1621+ vs DS1621xs+ NAS – Storage

Yet another area where the difference between these two 6-Bay NAS is remarkably slim at first glance. Both support 16/18TB NAS hard drives, currently from WD Red and Seagate Ironwolf, ou to attach two units of the eSATA connected DX517 5-Bay expansion JBOD, which will total 16 maximum drives in your storage architecture. This will need to be funneled into storage pools and volumes, but at current maximum capacity NAS hard drives, both the DS1621+ and DS1621xs+ allows (to date):

NAS in RAID 0 =108TB*

NAS in RAID 5 = 90TB*

NAS in RAID 6 = 72TB*

NAS & 2x DX517 Expansion in RAID 0 =288TB*

NAS & 2x DX517 Expansion in RAID 5 = 270TB*

NAS & 2x DX517 Expansion in RAID 6 = 252TB*

(*Terobytes, assuming full bay population and 18TB NAS HDDs)

So regardless of which Synology 6-Bay system between these two that you decide to buy, you are still going to get the same storage potential ultimately. That said, in order to reach the top end capacities, you WILL need more memory in order to get support and full speed, which although both systems support upto 32GB, the DS1621xs+ DOES arrive with 4GB more on Day 1. Additionally, both systems arrive with M.2 NVMe SSD cache slots (which cannot be used for raw storage) that allow you to install super-fast PCIe based SSD that will bolster your larger, but slower HDD RAID array with the high IOPs, performance and low latency of the SSDs. It works out much, MUCH more affordable than filling a NAS with all SSDs and is around 10-20% faster than HDDs on their own with more commonly accessed/shared files, but likewise, the more cache you want to use/need, the more memory you will need to have free on your system ,which gives the DS1621xs+ another small advantage.

However, these small early memory benefits in storage performance pale in comparison to the advantage the DS1621+ being the ONLY one of the two that supports Synology Hyrbid RAID (SHR) which allows users to mix drive capacities inside a single RAID group. Typically, in traditional RAID, if you installed different size drives, the system will only ‘see’ them all as the smaller available drive size, so it can ensure that it is able to retrieve data from a single drive failing. SHR will just ensure that there is 1x drive of the capacity protected from drive failure, then just combine the total capacity available into a much bigger array. Very few people take advantage of this on day 1 of their NAS purchase, as they would rather buy the NAS and populate with new drives of the same capacity. However, years down the line, as your storage fills up, the idea of removing some drives and gradually replacing with much, much bigger drives is very appealing and can work out to be much more cost-effective in the long run. SHR and SHR-2 (2 drive fluid RAID protection) have become a very popular selling point for Synology and its precedence in the DS1621+ will definitely be noted by many. However, the DS1621xs+ does not allow you to create an SHR configuration, limiting you to just the traditional RAID 0/1/5/610/etc. Synology explains that the reason for this position is that SHR, although very flexible, does not quite give the same peak Read/Write performance compared with traditional RAID and more enterprise RAID solutions like the XS+ series are used by large numbers of people or more demanding software service use – therefore they remove SHR as a choice to ensure that the enterprise users get the very best performance by default. It’s still a shame and many users are not best pleased about lack of SHR on the DS1621xs+, but if you are upgrading an existing Synology NAS system to the DS1621xs+ and you currently have an SHR configuration, you CAN migrate it over (see video below).

Ultimately, in terms of storage, the SHR on the DS1621+ is just too good a feature not to give it the point in the storage round. Both systems support the traditional RAID configs, as well as NVMe caching support and the DS1621xs+ still gives that tiniest bit extra storage performance thanks to that CPU+Memory Day 1 combo BUT with SHR on the DS1621+ NAS, you just have more storage flexibility that will be exceptionally useful later on.

Result – You Should Buy the Synology DS1621xs+ NAS Because of SHR

Synology DS1621+ vs DS1621xs+ NAS – Conclusion

It really does come down to Value, Scalability and Performance when comparing the DS1621+ and DS1621xs+ NAS. The Newer (by a month!) Synology DS1621+ brings a lovely middle ground of hardware vs storage for the price tag, as well as the expandability and fluidity of its internal upgrades and support of Synology Hybrid RAID, thereby ensuring that you can leverage your budget more towards storage/drive-media and not have to pay for upgrades on day 1 that you might not use for years/at all. That said, the DS1621xs+ is just better value overall, giving you a CPU several times more powerful and more memory for faster internal performance, 10Gbe and PCIe Upgradability together to give you better short AND long term external performance and then you have a longer manufacturers warranty at 5yrs TOO! The lack of SHR is a bit of ablow, but you are just getting more hardware for your money here in the DS1621+ and it only takes the necessity of 1-2 of these features to make the additional spend worth in in the years this system will be working hard.

Result – You Should Buy the Synology DS1621xs+ NAS Because You Get More For Your Money



SYNOLOGY DS1621xs+ NAS Drive



Click Below to read the reviews of the Synology DS1621+ & Synology DS1621xs+ NAS:


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    52 thoughts on “Synology DS1621+ vs DS1621xs+ NAS Comparison

    1. Jesus Christ so what. SHR gives you access to the extra storage on the larger drives you install. When a traditional raid makes wait until all drives are replaced with the same capacity. So one logic makes you wait u til you finished upgrading drives and the other gives you gratification sooner. It’s personal preference. SHR isn’t as stable as the traditional raids. So when you use SHR on a business class raid and you run into problems. What’s going to happen. People will complain and want to be compensated. People would blame Synology and say why would they do this knowing SHR isn’t as stable as the traditional raids. Synology took away the customers ability to screw up their raid and blame them. And you know people would do exactly. Want SHR then buy a lower end NAS. Want a higher end NAS then deal with it. Right here you prove Synology’s point. You want the gphigher end NAS but don’t want to deal with the costs involved with it. Having a higher end NAS but running it with lower performance architecture. Then when it fails you complain. Synology in a way is doing like Apple does by building in a better experience. By wanting SHR on the higher class of NAS proves you don’t want a higher class of NAS. Let me buy a Ferrari that has an high compression engine then complain because I can’t put regular gas in it. Some people are never happy. Thumbs down

    2. Excellent review, very helpful. Subbed! Not sure which DS1621 to get, having just sold a rather more powerful QNAP with an i3. I feel 10 GbE file transfer is a more important role, and the TVS-672XT did much more file tossing than movie playing! Going for the 6 or 8 bay Synology in large part just to have something a bit quieter on the desk, and I am curious to see how the OS has evolved, since I last had one, five years ago. Personally, I would rate QNAP hardware generally superior, but the Synology OS and eco-system, is much better integrated.

    3. The data itself is on an HDD from the beginning. Seems you are testing the read limits of your HDD, thats all. I’m copying 12GB of data to an NVMe storage in less than 1 minute, and thats with USB3.0. With thunderbolt it’s only a few seconds. The limiting factor is then your connection speed like 1GBE or 10GBE. Copying internally without any connection should do the best out of it, but your limit is the reading speed of your HDD, where the data is stored.

    4. Thanks for all the information, i have a quick question for you sir. what do you think if the DS1621+ have the same SSD cache and 10Gb net, is the speed will be the same with your test? Thx

    5. I wouldn’t t spend $1500 on a nas. I’d rather buy a HDD bay and a used Dell optiplex. The savings alone would cover half the cost on Nas HDD’s. Not to mention the performance of a more modern Intel CPU.

    6. ….Should i buy 2x Samsung SSD 970 EVO Plus 250GB, M.2 (MZ-V7S250BW) …for a DS920+ ??? …many people say if the „Wear_Levelling_Count“ (Samsung Life Span Figure) is reached they (Synology) shut it off. And many people say it only last about 2 years!

    7. Great vid, the xs+ series are top end in Synology and geared towards business.
      I have the dual 10G card installed on 2 of these units in an HA setup with the built in 10G as the heartbeat and the card’s 2x10G in LACP. Planing to go all flash on the internal 6 bays (using RAID F1 which you showed on the specs comparison but didn’t mention), and I have an expansion bay with a 5 disk RAID5 array Cached (r/w) on the 2 NVMe drives.
      30Gbps I believe is necessary. Not for the home/Soho , but for an SMB you can’t otherwise get this type of performance , protection And convenience for this price!

    8. Thank you very much for the great comparison review.
      PS: It’s kind of strange why audio volume is so low (I think youtube must add some ‘autocheck’ for uploaded content volume recorded as a warning, this forces to bump up volume, then when switch to other ‘normally’ recorded your ears will get a huge hit from your speakers (you will wake up the whole house if watch video in the night ) 🙂

    9. I currently have a 918+ 4x4tb that is mainly a Plex server and storage. I’d like to run some VM, but whenever I try to run Ubuntu, it is horribly slow. I wouldn’t mind adding more power and another two bays, but if the no gpu would hinder Plex, then maybe this isn’t what I want. Is there a good balance between Plex and VM?

    10. Wonder if you could do a part 2 of this video and see what happens when you try to add additional new, larger drives to the volume… Does the SHR accomodate them as a true SHR volume, or does the system treat them as if it were a traditional RAID?

    11. I beleiev that cache is more important in applications such as VM’s or docker .. mainly applications which repeat a lot like running mqtt for a vast automation … where the same data will go back and forth on a daily basis .. that’s where the cache would excel ..

      I also believe that you don’t need the nvme for cache as SATA/sata nand will suffice … Unless you have 10gbit network which requires 1gb to be transfered in ms which is not for home applications anyhow ..

    12. Didn’t search in all comments, how much costs the 2 year warranty extension of the DS1621+ ?
      As you said, add the 10GB card and 4GB more memory is around 200 bucks and the difference is still 400 bucks…..
      If the warranty extension costs 200 bucks, the difference is quite melted. As well the Xs+ has faster USB Ports (might be good for backup)

    13. Is it possible to do multiple vlan interfaces on this unit?
      I’ll be presenting cifs and iscsi and to different network segments? I can do it on QNAP, but this Synology has my interest over the TS-673A.
      Virtual is handled elsewhere and I’d only moved it to the storage unit for power usage reasons etc.

    14. your reviews are great. However, by the time you’re done I’m more confused then I went in. How about a review of a nas that covers everything a users would want for backup and streaming, sharing. I currently own a DS920+ and it’s done everything I need, “above,” what would be the next step up!

    15. Great review. The lack of SHR for me is the main reason not to buy the DS1621xs along with the PCI slot that is actually useless. I would take the newer Ryzen even with slightly reduced performance as it will be far more efficient. Better still, buy the 1821+ and get two extra bays and stick the Dual 10GB card in that. I suspect the amount of DS1621xs sales will be quite low. If you really need to use your NAS for VM duties then look at QNAP for a true server processor IMHO. That coming from a 10 year + Synology owner!

    16. Possible typo on results…. for storage
      you wrote
      “Result – You Should Buy the Synology DS1621xs+ NAS Because of SHR”
      but you were praising SHR here
      “However, these small early memory benefits in storage performance pale in comparison to the advantage the DS1621+ being the ONLY one of the two that supports Synology Hyrbid RAID (SHR) which allows users to mix drive capacities inside a single RAID group.”
      Hybrid has typo too… I would recommend running a spell check on your article.
      Therefore, it should say
      “Result – You Should Buy the Synology DS1621+ NAS Because of SHR”

    17. You say “You Should Buy the Synology DS1621xs+ NAS Because of SHR”… but the DS1621xs+ DOESN’T have SHR. Not the only place in the article where it gets confusing.