DS1621xs+ vs DS1520+

Last updated on 16 Oct 2020 📧 Subscribe

comparison DS1621xs+ vs DS1520+

although 2 different classes, it would be nice to compare the differences because shared form factor to decide if price difference would be worth

CPU is almost 3 times faster. Also, Xeon is not multimedia friendly, but it’s powerful enough to cope with even 4K files. XS series have ECC RAM with is safer than regular RAM. You can also have a bigger volume thanks to a more RAM and a better CPU.

The big difference is PCI slot and 10GbE support. DS1520+ has no support.

And finally, you can not mix different size drives on XS series NAS since it is seen as an enterprise-class model and supports only standard well know RAIDs.

 

I hope this comparison table helps.

SpecsDS1621xs+DS1520+
CPU-Model Intel Xeon D-1527 Intel Celeron J4125
CPU Architecture 64-bit 64-bit
CPU Frequency 4-core 2.2 (base) / 2.7 (turbo) GHz 4-core 2.0 (base) / 2.7 (burst) GHz
Hardware Encryption Engine (AES-NI)
System-memory 8 GB DDR4 ECC SODIMM 8 GB DDR4 non-ECC
Memory Module Pre-installed 8 GB (8 GB x 1) 8 GB (4 GB + 4 GB)
Total Memory Slots 2 1
Maximum Memory Capacity 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 5
Maximum Drive Bays with Expansion Unit 16 (DX517 x 2) 15 (DX517 x 2)
M2-slots 2 (NVMe) 2 (NVMe)
Maximum Single Volume Size*
  • 200 TB (32 GB RAM required, for RAID 5 or RAID 6 groups only)
  • 108 TB
 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 2
eSATA Port 2 2
PCIe Expansion 1 x Gen3 x8 slot (x8 link)
Internal Drives
  • Btrfs
  • EXT4
  • Btrfs
  • EXT4
External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
Size (Height x Width x Depth) 166 mm x 282 mm x 243 mm 166 mm x 230 mm x 223 mm
Weight 5.3 kg 2.62 kg
System Fan 92 mm x 92 mm x 2 pcs 92 mm x 92 mm x 2 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
Brightness Adjustable Front LED Indicators
Power Recovery
Noise Level* 25.2 dB(A) 20.8 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 250 W 120 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) 		36.67 W (Access)
15.51 W (HDD Hibernation)
British Thermal Unit 214.45 BTU/hr (Access)
116.89 BTU/hr (HDD Hibernation) 		125.21 BTU/hr (Access)
52.96 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
  • EAC
  • VCCI
  • CCC
  • RCM
  • KC
  • FCC
  • CE
  • BSMI
  • EAC
  • VCCI
  • CCC
  • RCM
  • KC
  • FCC
  • CE
  • BSMI
Warranty 5 Years 3 Years
Environment RoHS Compliant RoHS Compliant
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Quick Installation Guide X 1
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Adapter X 1
  • AC Power Cord X 1
  • RJ-45 LAN Cable X 2
  • Quick Installation Guide X 1
Optional Accessories
  • DDR4 ECC SODIMM: D4ES01-8G
  • DDR4 ECC SODIMM: D4ECSO-2666-16G
  • Expansion Units: 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
  • Surveillance Device License Pack
  • Expansion Units: DX517
  • 2.5" SATA SSD: SAT5200
  • M.2 2280 NVMe SSD: SNV3400
  • VisualStation: VS960HD/VS360HD
  • Surveillance Device License Pack
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
  • RAID F1
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID Migration
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Volume Expansion with Larger HDDs
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
File Protocol CIFS/AFP/NFS/FTP/WebDAV CIFS/AFP/NFS/FTP/WebDAV
Maximum Concurrent CIFS/AFP/FTP Connections 2,000 2,000
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 32
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
  • Chrome
  • Firefox
  • Edge
  • Internet Explorer 10 onwards
  • Safari 10 onwards
  • Safari (iOS 10 onwards)
  • Chrome (Android 6.0 onwards)
  • Chrome
  • Firefox
  • Edge
  • Internet Explorer 10 onwards
  • Safari 10 onwards
  • Safari (iOS 10 onwards)
  • Chrome (Android 6.0 onwards)
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 1,200
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 450 100
Maximum Server Performance 3,363,000 emails per day, approx. 102GB 1,224,000 emails per day, approx. 37GB
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)
360 FPS @ 5M (2591x1944)
200 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)
1000 FPS @ 3M (2048x1536)
600 FPS @ 5M (2591x1944)
300 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) 500,000 (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) 350 (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) 4 (Learn more)
VPN Server
Maximum Connections 40 30
Total FPS (MJPEG) 680 FPS @ 720p (1280x720)
400 FPS @ 1080p (1920x1080)
300 FPS @ 3M (2048x1536)
200 FPS @ 5M (2591x1944)
SpecsDS1621xs+DS1520+


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