What is the difference between DS1621+ vs DS1621XS+?
CPU benchmark on a DS1621+ is around 5000. DS1621xs+ CPU benchmark is around 8000. You also have more RAM on XS model. You also get 10Gbit port built in and an option to add additional 10Gbit LAN via PCIe card.
In short, XS series model is much faster and made for better IOPS. This will speed up your virtual machines, web server or even Plex transcoding.
Here is a comparison table:
| Specs | DS1621xs+ | DS1621+ |
|---|---|---|
| CPU-Model | Intel Xeon D-1527 | AMD Ryzen V1500B |
| CPU Architecture | 64-bit | 64-bit |
| CPU Frequency | 4-core 2.2 (base) / 2.7 (turbo) GHz | 4-core 2.2 GHz |
| Hardware Encryption Engine (AES-NI) | ||
| System-memory | 8 GB DDR4 ECC SODIMM | 4 GB DDR4 ECC SODIMM |
| Memory Module Pre-installed | 8 GB (8 GB x 1) | 4 GB (4 GB x 1) |
| Total Memory Slots | 2 | 2 |
| Maximum Memory Capacity | 32 GB (16 GB x 2) | 32 GB (16 GB x 2) |
| Notes | The specifications vary depending on system configuration and memory size. | The specifications vary depending on system configuration and memory size. |
| Drive Bays | 6 | 6 |
| Maximum Drive Bays with Expansion Unit | 16 (DX517 x 2) | 16 (DX517 x 2) |
| M2-slots | 2 (NVMe) | 2 (NVMe) |
| Maximum Single Volume Size* |
| 108 TB |
| Hot Swappable Drive | ||
| RJ-45 1GbE LAN Port | 2 (with Link Aggregation / Failover support) | 4 (with Link Aggregation / Failover support) |
| RJ-45 10GbE LAN Port | 1 | |
| USB 3.0 Port | 3 | 3 |
| eSATA Port | 2 | 2 |
| PCIe Expansion | 1 x Gen3 x8 slot (x8 link) | 1 x Gen3 x8 slot (x4 link) |
| Internal Drives |
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| External Drives |
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| Size (Height x Width x Depth) | 166 mm x 282 mm x 243 mm | 166 mm x 282 mm x 243 mm |
| Weight | 5.3 kg | 5.1 kg |
| System Fan | 92 mm x 92 mm x 2 pcs | 92 mm x 92 mm x 2 pcs |
| Fan Speed Mode |
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| Easy Replacement System Fan | ||
| Brightness Adjustable Front LED Indicators | ||
| Power Recovery | ||
| Noise Level* | 25.2 dB(A) | 25.2 dB(A) |
| Scheduled Power On / Off | ||
| Wake on LAN / WAN | ||
| Power Supply Unit / Adapter | 250 W | 250 W |
| AC Input Power Voltage | 100 V to 240 V AC | 100 V to 240 V AC |
| Power Frequency | 50/60 Hz, Single Phase | 50/60 Hz, Single Phase |
| Power-Consumption |
62.85 W (Access) 34.26 W (HDD Hibernation) |
51.22 W (Access) 25.27 W (HDD Hibernation) |
| British Thermal Unit |
214.45 BTU/hr (Access) 116.89 BTU/hr (HDD Hibernation) |
174.77 BTU/hr (Access) 86.22 BTU/hr (HDD Hibernation) |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature | -20°C to 60°C (-5°F to 140°F) | -20°C to 60°C (-5°F to 140°F) |
| Relative Humidity | 5% to 95% RH | 5% to 95% RH |
| Certification |
|
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| Warranty | 5 Years | 3 Years |
| Environment | RoHS Compliant | RoHS Compliant |
| Packaging Content |
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| Optional Accessories |
|
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| Maximum Internal Volume Number | 256 | 64 |
| Maximum iSCSI Target Number | 256 | 128 |
| Maximum iSCSI LUN | 512 | 256 |
| iSCSI LUN Clone/Snapshot, Windows ODX | ||
| SSD Read / Write Cache (White Paper) | ||
| SSD TRIM | ||
| RAID Group | ||
| Supported RAID Type |
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| RAID Migration |
|
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| Volume Expansion with Larger HDDs |
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| Volume Expansion by Adding a HDD |
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| Global Hot Spare Supported RAID Type |
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| File Protocol | CIFS/AFP/NFS/FTP/WebDAV | CIFS/AFP/NFS/FTP/WebDAV |
| Maximum Concurrent CIFS/AFP/FTP Connections | 2,000 | 1,000 |
| Windows Access Control List (ACL) Integration | ||
| NFS Kerberos Authentication | ||
| Maximum Local User Accounts | 16,000 | 2,048 |
| Maximum Local Groups | 512 | 256 |
| Maximum Shared Folder | 512 | 512 |
| Maximum Shared Folder Sync Tasks | 32 | 16 |
| Synology High Availability | ||
| Log Center | ||
| Syslog Events per Second | 1,500 | 800 |
| VMware vSphere 6 with VAAI | ||
| Windows Server 2016 | ||
| Windows Server 2019 | ||
| Citrix Ready | ||
| OpenStack | ||
| Networking Protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV |
| Supported Browsers |
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| Supported Language | English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文 | English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文 |
| Antivirus by McAfee (Trial) | ||
| Central Management System | ||
| Synology Chat | ||
| Maximum Users | 2,900 | 1,800 |
| Document Viewer | ||
| Download Station | ||
| Maximum Concurrent Download Tasks | 80 | 80 |
| exFAT Access (Optional) | ||
| Synology MailPlus / MailPlus Server | ||
| Free Email Accounts | 5 (Licenses required for additional accounts) | 5 (Licenses required for additional accounts) |
| Maximum Number of Concurrent Users | 450 | 150 |
| Maximum Server Performance | 3,363,000 emails per day, approx. 102GB | 1,484,000 emails per day, approx. 45GB |
| Media Server | ||
| DLNA Compliance | ||
| Moments | ||
| Facial Recognition | ||
| Subject Recognition | ||
| Auto Color & Rotate | ||
| Moments Select | ||
| Snapshot Replication | ||
| Maximum Snapshots per Shared Folder | 1,024 | 1,024 |
| Maximum of System Snapshots | 65,536 | 65,536 |
| Surveillance Station | ||
| Maximum IP cam (Licenses required) | 75 (including 2 Free License) (See All Supported IP Cameras) | 40 (including 2 Free License) (See All Supported IP Cameras) |
| Total FPS (H.264) |
2250 FPS @ 720p (1280x720) 1050 FPS @ 1080p (1920x1080) 600 FPS @ 3M (2048x1536) 400 FPS @ 5M (2591x1944) 280 FPS @ 4K (3840x2160) |
1200 FPS @ 720p (1280x720) 1050 FPS @ 1080p (1920x1080) 600 FPS @ 3M (2048x1536) 440 FPS @ 5M (2591x1944) 320 FPS @ 4K (3840x2160) |
| Total FPS (H.265) |
2250 FPS @ 720p (1280x720) 2250 FPS @ 1080p (1920x1080) 1125 FPS @ 3M (2048x1536) 700 FPS @ 5M (2591x1944) 490 FPS @ 4K (3840x2160) |
1200 FPS @ 720p (1280x720) 1200 FPS @ 1080p (1920x1080) 1120 FPS @ 3M (2048x1536) 600 FPS @ 5M (2591x1944) 480 FPS @ 4K (3840x2160) |
| Synology Drive | ||
| Recommended Number of Hosted Files | 3,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) | 1,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) |
| Recommended Number of Concurrent Sync Clients | 900 (the number of connections that can be maintained when the recommended number of hosted files was reached) | 550 (the number of connections that can be maintained when the recommended number of hosted files was reached) |
| Synology Office | ||
| Video Station | ||
| Virtual Machine Manager | ||
| Recommended Virtual Machine Instances | 8 (Learn more) | 8 (Learn more) |
| VPN Server | ||
| Maximum Connections | 40 | 30 |
| Specs | DS1621xs+ | DS1621+ |
| Where to Buy a Product | |||
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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 is used 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 check HERE If you need to fix or configure a NAS, check Fiver Have you thought about helping others with your knowledge? Find Instructions Here
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Just bought the 1621xs+ for editing. 6 x 16TB Ironwolf Pros. 16gb ram. 2 x 800gb cache ssd. Solid as and great performance.Could add another card to support another edit suite without issue. 8 bays would have been better if I could find one available here at the moment but for my needs this is a great cost effective enterprise class solution. Especially with Ironwolf Pro16TB drives on sale for half price. Should my PC’s 32tb internal RAID fail I have back up media that will play back almost as well.
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The audio on this video is low.
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So I ordered the DS1621xs+ but while in transit to my door, I saw this review and realized that it doesn’t have the Hybrid RAID (SHR) that I guess ONLY the lower-end Synology NAS systems like the 1621+ come equipped with. Why on Earth would Synology take OUT this useful feature from of a higher end model is beyond me! I hope that the folks here at NASCompares really stick it to Synology so that they implement it into future higher-end NAS boxes.
I understand that SHR is perhaps not the most efficient of RAID configurations, but anyone who has HDDs of varying sizes like I do needs to use a Hybrid RAID otherwise there will be tons of wasted space. So instead of keeping the functionality in the higher end systems and allowing the user to decide what they want to use, Synology removes the feature and forces us to use a traditional RAID configuration where all the HDDs need to be the same size to fully utilize the space.
So, Synology, instead of getting $1,700 from me for the xs, you’re going to only get $700 on the lesser model when I return the xs for the 1621+ that has SHR…. and I’m then not as happy of a customer for getting something less than I was expecting. Boo Synology, Boo!
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Is it still true in 2022 that the ds1621xs has to have all the same drive sizes for Raid 6?
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Thanks for all your videos! One thing i wish they had in future – a conclusion section – for those that dont have lots of spare time. Thanks again!
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Very, very, very useful and pleasure to watch video! Many Thans!
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Excellent review and really good comment onto the selection among these two models. Thanks.
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Thank you for a great explanation I’m very new to this tech and this article has helped me make an informed decision Cheers!!
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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.
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I’d choose the the one that has shr. It’s one main reason why I jumped into Synology.
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Are 1621+ and 1821+ can still transcode and stream 4k movies?
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So bizarre that the xs doesn’t support SHR. May not have the raw performance, but nice if they gave the customer the option
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Hmm, will the cheaper one still be alright for editing video? (6k BRAW on specced out mid 2017 iMac in Davinci Resolve) Or should I look for a NAS with Thunderbolt 3 instead?
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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!
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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 ) 🙂
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The XS, being 600 quid more expensive, would have to be a hell of a lot better to justify buying
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thanks for the review – good information all around.
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then i have to say,i have buyed the right one of these 2 for me,and it is the 1621+ +10gb adapter+4gb ram-4x6tb wd red pro+2x wd red pro 2gb.
for me–perfect solution for what i wanna do????thx so much for your vids++++
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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)
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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!
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