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Product comparison · 2 nas & storage servers

QNAP TS-251+ NAS Tower Intel® Celeron® DDR3L vs QNAP TS-451+ NAS Tower Intel® Celeron® DDR3L

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  • 98specifications compared
  • 12differ
  • 86identical
  • 1known for one product only

Key differences

  • Total installed storage capacity
    • 4 TB
    • 8 TB
  • Number of storage drives installed
    • 2
    • 4
  • Number of storage drives supported
    • 2
    • 4
  • RAID levels
    • 0, 1, JBOD
    • 0, 1, 5, 6, 10, JBOD
  • Fan diameter
    • 7 cm
    • 12 cm
  • Noise level
    • 15.4 dB
    • 16.9 dB
  • Power supply unit (PSU) capacity
    • 60 W
    • 90 W
  • Power consumption (typical)
    • 18.09 W
    • 33.88 W

Side by side

Differences highlightedShow differences only
99 specifications
A

QNAP

TS-251+ NAS Tower Intel® Celeron® DDR3L

Model TS-251+

View product
B

QNAP

TS-451+ NAS Tower Intel® Celeron® DDR3L

Model TS-451+

View product
Storage4 differ
Storage drives installedYesYes
Total installed storage capacityDiffers4 TB8 TB
Number of storage drives installedDiffers24
Number of storage drives supportedDiffers24
Installed storage drive typeHDDHDD
Supported storage drive typesHDD & SSDHDD & SSD
Storage drive capacity2 TB2 TB
Supported storage drive interfacesSerial ATA II, Serial ATA IIISerial ATA II, Serial ATA III
Storage drive sizes supported2.5,3.5"2.5,3.5"
RAID supportYesYes
RAID levelsDiffers0, 1, JBOD0, 1, 5, 6, 10, JBOD
Online RAID migrationYesYes
Online RAID expansionYesYes
Hot-swap drive baysYesYes
Supported file systemsFAT32, HFS+, NTFS, exFAT, ext3, ext4FAT32, HFS+, NTFS, exFAT, ext3, ext4
Bad block scanYesYes
Processoridentical
Processor familyIntel® Celeron®Intel® Celeron®
Processor frequency2 GHz2 GHz
Processor cores44
Memoryidentical
Internal memory typeDDR3LDDR3L
Memory clock speed1600 MHz1600 MHz
Maximum RAM supported8 GB8 GB
Memory form factorSO-DIMMSO-DIMM
Memory slots22
Flash memory512 MB512 MB
Networkidentical
Ethernet LANYesYes
Ethernet LAN data rates10,100,1000 Mbit/s10,100,1000 Mbit/s
Wi-FiNoNo
DHCP clientYesYes
DHCP serverYesYes
Jumbo frames supportYesYes
iSCSI supportYesYes
Wake-on-LAN readyYesYes
Dynamic DNS (DDNS)YesYes
Link aggregationYesYes
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 portYesYes
USB 2.0 ports quantity22
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity22
Fiber ports quantity00
HDMI ports quantity11
Design1 differ
Chassis typeTowerTower
Cooling typeActiveActive
Product colourBlackBlack
Number of fans1 fan(s)1 fan(s)
Fan diameterDiffers7 cm12 cm
LED indicatorsHDD, LAN, Power, Status, USBHDD, LAN, Power, Status, USB
Cable lock slotYesYes
Cable lock slot typeKensingtonKensington
Performance1 differ
TypeNASNAS
Device classHome & Home OfficeHome & Home Office
Backup functionYesYes
Backup featuresCloud, USB drive, iSCSI LUNCloud, USB drive, iSCSI LUN
BuzzerYesYes
Noise levelDiffers15.4 dB16.9 dB
SnapshotYesYes
Management protocolsSNMPSNMP
Share folder access right managementYesYes
Web-based managementYesYes
Backup buttonYesYes
Browser supportedApple Safari 7+, Google Chrome, Microsoft Internet Explorer 10+, Mozilla FirefoxApple Safari 7+, Google Chrome, Microsoft Internet Explorer 10+, Mozilla Firefox
Built-in FTP serverYesYes
Built-in iTunes serverYesYes
On/off switchYesYes
Remotely operatedYesYes
Reset buttonYesYes
S.M.A.R.T. supportYesYes
Security algorithms256-bit AES, FIPS 140-2, HTTPS, SSH256-bit AES, FIPS 140-2, HTTPS, SSH
Share folder512512
System logYesYes
Universal Plug and Play (UPnP)YesYes
Softwareidentical
Operating system installedQNAP Turbo SystemQNAP Turbo System
Operating system version4.34.3
Windows operating systems supportedWindows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 Pro, Windows 10 Pro x64, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 HomeWindows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 Pro, Windows 10 Pro x64, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home
Linux operating systems supportedYesYes
Mac compatibilityYesYes
Mac operating systems supportedMac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 MavericksMac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks
Server operating systems supportedWindows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016
Power3 differ
Power supply locationExternalExternal
Power supply unit (PSU) capacityDiffers60 W90 W
Power consumption (typical)Differs18.09 W33.88 W
Power consumption (sleep)0.57 W0.57 W
Power consumption (HDD standby)Differs10.56 W15.78 W
AC input voltage100 - 240 V100 - 240 V
Fan voltage12 V12 V
Weight & dimensions3 differ
WidthDiffers102 mm160 mm
Depth219 mm219 mm
Height169 mm169 mm
WeightDiffers1.28 kg3 kg
Package weightDiffers2.32 kg4.3 kg
Packaging contentidentical
External power adapterYesYes
Cables includedAC, LAN (RJ-45)AC, LAN (RJ-45)
Quick installation guideYesYes
Number of screwsKnown for one14
Remote control includedYesYes
Operational conditionsidentical
Operating temperature (T-T)0 - 40 °C0 - 40 °C
Operating relative humidity (H-H)5 - 95%5 - 95%
Other featuresidentical
Number of simultaneous users4096 user(s)4096 user(s)

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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