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Product comparison · 2 nas & storage servers

QNAP TS-651 NAS/storage server Tower Intel® Celeron® vs QNAP TS-851 NAS/storage server Tower Intel® Celeron®

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  • 70specifications compared
  • 12differ
  • 58identical
  • 1known for one product only

Key differences

  • Number of storage drives supported
    • 6
    • 8
  • Fan diameter
    • 9 cm
    • 12 cm
  • Power supply unit (PSU) capacity
    • 250 W
    • 350 W
  • Power consumption (typical)
    • 39.42 W
    • 56.79 W
  • Power consumption (sleep)
    • 0.41 W
    • 0.72 W
  • Width
    • 257 mm
    • 298.2 mm
  • Depth
    • 235 mm
    • 235.4 mm
  • Height
    • 175 mm
    • 185.2 mm

Side by side

Differences highlightedShow differences only
71 specifications
A

QNAP

TS-651 NAS/storage server Tower Intel® Celeron®

Model TS-651

View product
B

QNAP

TS-851 NAS/storage server Tower Intel® Celeron®

Model TS-851

View product
Storage2 differ
Storage drives installedNoNo
Total installed storage capacity0 TB0 TB
Number of storage drives installed00
Number of storage drives supportedDiffers68
Supported storage drive typesHDD & SSDHDD & SSD
Storage drive interfaceSerial ATA IIISerial ATA III
Storage drive size2.5/3.5"2.5/3.5"
RAID supportYesYes
RAID levels0, 1, 5, 6, 10, JBOD0, 1, 5, 6, 10, JBOD
Hot-swap drive baysYesYes
Supported file systemsDiffersext4, FAT32, HFS+, NTFSext3, ext4, FAT32, HFS+, NTFS
Processoridentical
Processor familyIntel® Celeron®Intel® Celeron®
Processor frequency2.41 GHz2.41 GHz
Processor cores22
Memoryidentical
Internal memory1 GB1 GB
Internal memory typeDDR3LDDR3L
Maximum RAM supported8 GB8 GB
Flash memory512 MB512 MB
Networkidentical
Ethernet LANYesYes
Ethernet LAN data rates10,100,1000 Mbit/s10,100,1000 Mbit/s
DHCP clientYesYes
DHCP serverYesYes
Jumbo frames supportYesYes
iSCSI supportYesYes
Wake-on-LAN readyYesYes
Supported network protocolsCIFS/SMB, AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSCCIFS/SMB, AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC
Ports & interfacesidentical
Ethernet LAN (RJ-45) ports22
USB 2.0 ports quantity22
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity33
Fiber ports quantity00
HDMI ports quantity11
Design1 differ
Chassis typeTowerTower
Cooling typeActiveActive
Product colourBlackBlack
Number of fans2 fan(s)2 fan(s)
Fan diameterDiffers9 cm12 cm
LED indicatorsYesYes
Built-in displayNoNo
Cable lock slotYesYes
Cable lock slot typeKensingtonKensington
Performance1 differ
TypeNASNAS
Device classHome & Home OfficeHome & Home Office
Backup functionYesYes
BuzzerYesYes
Multilingual supportYesYes
Built-in optical driveNoNo
Card reader integratedNoNo
Management protocolsKnown for oneSNMP, Telnet
Web-based managementYesYes
Access Control List (ACL)YesYes
Reset buttonYesYes
Security algorithmsDiffers256-bit AES, FIPS 140-2, HTTPS, SSH, SSL/TLSFIPS 140-2, HTTPS, SSH, SSL/TLS
Softwareidentical
Operating system installedQNAP Turbo SystemQNAP Turbo System
Operating system version4.14.1
Windows operating systems supportedYesYes
Linux operating systems supportedYesYes
Mac operating systems supportedYesYes
Power3 differ
Power supply unit (PSU) capacityDiffers250 W350 W
Power consumption (typical)Differs39.42 W56.79 W
Power consumption (sleep)Differs0.41 W0.72 W
AC input voltage100-240 V100-240 V
AC input frequency50 - 60 Hz50 - 60 Hz
Fan voltage12 V12 V
Weight & dimensions5 differ
WidthDiffers257 mm298.2 mm
DepthDiffers235 mm235.4 mm
HeightDiffers175 mm185.2 mm
WeightDiffers6.18 kg7.83 kg
Package weightDiffers6.9 kg8.9 kg
Operational conditionsidentical
Operating temperature (T-T)0 - 40 °C0 - 40 °C
Operating relative humidity (H-H)5 - 95%5 - 95%
Other featuresidentical
Digital Living Network Alliance (DLNA) certifiedYesYes

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.

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