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Product number
  • 830776
  • 865961
  • 869007
  • 866809
  • 865076
Manufacturer code
  • RS819
  • DS920+
  • DS1520+
  • TS-451DeU-2G
  • DS420+
Brand
  • Synology
  • Synology
  • Synology
  • QNAP
  • Synology
Warranty
  • 2 years
  • 3 years
  • 3 years
  • 2 years
  • 2 years
Warranty type
  • Carry-in warranty
  • Carry-in warranty
  • On-site service
  • Carry-in warranty
  • Carry-in warranty
Old product returned for free
  • Yes
  • Yes
  • Yes
  • Yes
  • Yes

Number of hard drive bays
  • 4
  • 4
  • 5
  • 4
  • 4
Internal RAM
  • 2 GB
  • 4 GB
  • 8 GB
  • 2 GB
  • 2 GB
Total number of RAM slots
  • 0
  • 1
  • 1
  • 1
Integrated hard drive
  • No
  • No
  • No
  • No
  • No
Suitable for hard drive size
  • 2,5 inch HDD, 2,5 inch SSD, 3.5-inch HDD
  • 2,5 inch HDD, 3.5-inch HDD
  • 2,5 inch HDD, 2,5 inch SSD, 3.5-inch HDD
  • 2,5 inch HDD, 2,5 inch SSD, 3.5-inch HDD
  • 2,5 inch HDD, 2,5 inch SSD, 3.5-inch HDD, M.2
Cache memory
  • 0 MB
  • 0 MB
  • 0 MB
  • 4 GB
  • 0 MB
SATA connector type
  • S-ATA (III)
  • mSATA (6Gb/s)
  • S-ATA (III)
  • PCI-e 2.0 x4, S-ATA (III)
  • S-ATA (III)
RAID
  • JBOD, RAID 0, RAID 1, RAID 10, RAID 5, RAID 6, Synology Hybrid RAID
  • JBOD, RAID 0, RAID 1, RAID 10, RAID 5, RAID 6, Synology Hybrid RAID
  • Hot spare, JBOD, RAID 0, RAID 1, RAID 10, RAID 5, RAID 6, Synology Hybrid RAID
  • BeyondRAID, Hot spare, JBOD, RAID 0, RAID 1, RAID 10, RAID 5, RAID 5+spare, RAID 6, SimplyRAID
  • JBOD, RAID 0, RAID 1, RAID 10, RAID 5, RAID 6, Synology Hybrid RAID

NAS functions
  • Backup server, Download server, FTP server, Mail server, Media server, Photo server, Surveillance station, VPN server, Web server, iTunes server
  • Backup server, Download server, FTP server, Mail server, Photo server, Surveillance station, VPN server, Web server, iTunes server
  • Backup server, Database server, Download server, FTP server, Mail server, Media server, Photo server, Surveillance station, VPN server, Web server, iTunes server
  • Backup server, Database server, Download server, FTP server, Mail server, Media server, Photo server, Print server, Surveillance station, VPN server, Web server, iTunes server
  • Backup server, Download server, FTP server, Mail server, Photo server, Surveillance station, VPN server, Web server, iTunes server
NAS application center
  • Yes
  • Yes
  • Yes
  • Yes
  • Yes
DLNA
  • No
  • No
  • Yes
  • Yes
  • No
UPnP AV support
  • No
  • No
  • No
  • Yes
  • No
FTP server
  • Yes
  • Yes
  • Yes
  • Yes
  • Yes
On/off switch
  • Yes
  • Yes
  • Yes
  • Yes
  • Yes
Kensington lock
  • No
  • No
  • Yes
  • Yes
  • No
Apple Time Machine support
  • Yes
  • Yes
  • Yes
  • Yes
  • Yes
Chromecast support
  • Yes
  • Yes
  • Yes
  • Yes
  • Yes
Maximum number of simultaneous users
  • More than 10
  • More than 10
  • More than 10
  • More than 10
  • More than 10
Number of IP camera licenses included
  • None
  • 2
  • 2
  • 8
  • 2
Plex support
  • No
  • Yes
  • Yes
  • Yes
  • No
Automatic switch on/off
  • Yes
  • Yes
  • Yes
  • Yes
  • No
Suitable for IFTTT
  • No
  • No
  • No
  • Yes
  • No
Recommended for use
  • Making a backup, Save photos and videos
  • Business use, Making a backup, Media streaming, Personal cloud, Save photos and videos, Storing games
  • Business use, Making a backup, Media streaming, Personal cloud, Save photos and videos, Storing games
  • Business use, Making a backup, Media streaming, Personal cloud, Save photos and videos
  • Making a backup, Save photos and videos
Plex support type
  • 4K (Ultra HD) (2160p)
  • 4K (Ultra HD) (2160p), Full HD (1080p), HD Ready (720p), SD (480p)

Best tested
  • No
  • No
  • No
  • No
  • No

LACP Link aggregation
  • Yes
  • Yes
  • Yes
  • Yes
  • Yes
iSCSI support
  • Yes
  • Yes
  • No
  • Yes
  • Yes
Thunderbolt connector
  • No
  • No
  • No
  • No
  • No
Number of female standard USB-A ports
  • 2
Female standard USB-A port version
  • 3.0
Connection type
  • Wired
  • Wired
  • Wired
  • Wired, Wireless
  • Wired
Ethernet speed
  • Gigabit Ethernet (1000Mbps)
  • Gigabit Ethernet (1000Mbps)
  • Gigabit Ethernet (1000Mbps)
  • 2.5 Gigabit Ethernet (2500 Mbps)
  • Gigabit Ethernet (1000Mbps)
Number of ethernet ports
  • 2
  • 2
  • 4
  • 2
  • 2
Bluetooth
  • No
  • No
  • No
ANT+
  • No

Processor
  • RealTek
  • Intel Celeron
  • Intel Celeron
  • Intel Celeron
  • Intel Celeron
Processor brand
  • RealTek
  • Intel
  • Intel
  • Intel
  • Intel
Processor family
  • RealTek
  • Celeron
  • Celeron
  • Celeron
  • Celeron
Processor code name
  • RealTek
  • Gemini Lake Refresh
  • Coffee Lake
  • Gemini Lake
  • Gemini Lake Refresh
Processor cores
  • Quad-Core (4)
  • Quad-Core (4)
  • Quad-Core (4)
  • Quad-Core (4)
  • Dual-core (2)
Clock speed
  • 1,4 GHz
  • 2 GHz
  • 2 GHz
  • 2 GHz
  • 2 GHz
Turbo speed
  • 0 GHz
  • 2,7 GHz
  • 2,4 GHz
  • 2,7 GHz
  • 2,9 GHz

Depth
  • 32,8 cm
  • 23 cm
  • 23 cm
  • 50,9 cm
  • 23 cm
Width
  • 47,8 cm
  • 20 cm
  • 23 cm
  • 48,2 cm
  • 20 cm
Height
  • 4,4 cm
  • 17 cm
  • 17 cm
  • 4,3 cm
  • 17 cm
Type NAS
  • Rackmount
  • Upright
  • Upright
  • Rackmount
  • Upright
Color
  • Black
  • Black
  • Black
  • Black
  • Black
Weight
  • 4,34 kg
  • 2,24 kg
  • 2620 g
  • 8,12 kg
  • 2,18 kg
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