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Product comparison · 2 nas & storage servers

QNAP TS-251 NAS/storage server Tower Intel® Celeron® vs QNAP TS-651 NAS/storage server Tower Intel® Celeron®

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  • 66specifications compared
  • 14differ
  • 52identical
  • 7known for one product only

Key differences

  • Number of storage drives supported
    • 2
    • 6
  • RAID levels
    • 0, 1, JBOD
    • 0, 1, 5, 6, 10, JBOD
  • USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity
    • 2
    • 3
  • Product colour
    • White
    • Black
  • Number of fans
    • 1 fan(s)
    • 2 fan(s)
  • Fan diameter
    • 7 cm
    • 9 cm
  • Power supply unit (PSU) capacity
    • 60 W
    • 250 W
  • Power consumption (typical)
    • 19.22 W
    • 39.42 W

Side by side

Differences highlightedShow differences only
73 specifications
A

QNAP

TS-251 NAS/storage server Tower Intel® Celeron®

Model TS-251

View product
B

QNAP

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

Model TS-651

View product
Storage3 differ
Storage drives installedNoNo
Total installed storage capacityKnown for one0 TB
Number of storage drives installed00
Number of storage drives supportedDiffers26
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 levelsDiffers0, 1, JBOD0, 1, 5, 6, 10, JBOD
Hot-swap drive baysYesYes
Supported file systemsDiffersext3, ext4, FAT32, HFS+, NTFSext4, 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 & interfaces1 differ
Ethernet LAN (RJ-45) ports22
USB 2.0 ports quantity22
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantityDiffers23
Fiber ports quantity00
HDMI ports quantity11
Design3 differ
Chassis typeTowerTower
Cooling typeActiveActive
Product colourDiffersWhiteBlack
Number of fansDiffers1 fan(s)2 fan(s)
Fan diameterDiffers7 cm9 cm
LED indicatorsYesYes
Built-in displayNoNo
Cable lock slotYesYes
Cable lock slot typeKensingtonKensington
Performanceidentical
TypeNASNAS
Device classHome & Home OfficeHome & Home Office
Backup functionYesYes
BuzzerYesYes
Multilingual supportYesYes
Built-in optical driveNoNo
Card reader integratedNoNo
Web-based managementYesYes
Access Control List (ACL)YesYes
Reset buttonYesYes
Security algorithms256-bit AES, FIPS 140-2, HTTPS, SSH, SSL/TLS256-bit AES, FIPS 140-2, HTTPS, SSH, SSL/TLS
Management protocolsKnown for oneSNMP v2 & v3
Softwareidentical
Operating system installedQNAP Turbo SystemQNAP Turbo System
Operating system version4.14.1
Windows operating systems supportedYesYes
Linux operating systems supportedKnown for oneYes
Mac operating systems supportedYesYes
Power2 differ
Power supply unit (PSU) capacityDiffers60 W250 W
Power consumption (typical)Differs19.22 W39.42 W
Power consumption (sleep)Known for one0.41 W
AC input voltage100-240 V100-240 V
AC input frequencyKnown for one50 - 60 Hz
Fan voltage12 V12 V
Redundant power supply (RPS) supportKnown for oneNo
Weight & dimensions5 differ
WidthDiffers102 mm257 mm
DepthDiffers225 mm235 mm
HeightDiffers168.5 mm175 mm
WeightDiffers1.28 kg6.18 kg
Package weightDiffers2.32 kg6.9 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
Packaging contentidentical
External power adapterKnown for oneYes

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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