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Product comparison · 2 nas & storage servers

QNAP TS-251-4G NAS/storage server Tower Intel® Celeron® vs QNAP TS-651-4G NAS/storage server Tower Intel® Celeron®

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  • 40specifications compared
  • 11differ
  • 29identical
  • 6known for one product only

Key differences

  • Number of storage drives supported
    • 2
    • 6
  • USB 2.0 ports quantity
    • 2
    • 3
  • Product colour
    • Grey, White
    • Black
  • Power supply location
    • External
    • Built-in
  • Power consumption (typical)
    • 19.22 W
    • 39.42 W
  • Power consumption (sleep)
    • 0.47 W
    • 0.41 W
  • Width
    • 102 mm
    • 257 mm
  • Depth
    • 225 mm
    • 235 mm

Side by side

Differences highlightedShow differences only
46 specifications
A

QNAP

TS-251-4G NAS/storage server Tower Intel® Celeron®

Model TS-251-4G

View product
B

QNAP

TS-651-4G NAS/storage server Tower Intel® Celeron®

Model TS-651-4G

View product
Storage1 differ
Storage drives installedNoNo
Number of storage drives installed00
Number of storage drives supportedDiffers26
Supported storage drive typesHDD & SSDHDD & SSD
Storage drive interfaceSerial ATA II, Serial ATA IIISerial ATA II, Serial ATA III
Storage drive size2.5/3.5"2.5/3.5"
RAID supportYesYes
Hot-swap drive baysYesYes
Processoridentical
Processor familyIntel® Celeron®Intel® Celeron®
Processor frequency2.41 GHz2.41 GHz
Processor cores22
Memoryidentical
Internal memory4 GB4 GB
Internal memory typeDDR3LDDR3L
Maximum RAM supportedKnown for one8 GB
Networkidentical
Ethernet LANYesYes
Ethernet LAN data rates10,100,1000 Mbit/s10,100,1000 Mbit/s
Wi-FiNoNo
DHCP clientKnown for oneYes
DHCP serverKnown for oneYes
Ports & interfaces1 differ
Ethernet LAN (RJ-45) ports22
USB 2.0 ports quantityDiffers23
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity22
HDMI ports quantity11
Design1 differ
Chassis typeTowerTower
Cooling typeActiveActive
Product colourDiffersGrey, WhiteBlack
Number of fans1 fan(s)1 fan(s)
LED indicatorsKnown for oneYes
Performanceidentical
TypeNASNAS
Device classHome & Home OfficeHome & Home Office
Softwareidentical
Operating system installedQNAP Turbo SystemQNAP Turbo System
Operating system version4.14.1
Power3 differ
Power supply locationDiffersExternalBuilt-in
Number of power supply units11
Power consumption (typical)Differs19.22 W39.42 W
Power consumption (sleep)Differs0.47 W0.41 W
AC input voltage100-240 V100-240 V
AC input frequencyKnown for one50 - 60 Hz
Power supply unit (PSU) capacityKnown for one60 W
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%

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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