Product comparison · 2 nas & storage servers

QNAP TS-251+ NAS Tower Intel® Celeron® DDR3L vs QNAP TS-451-4G, 8TB

65specifications compared
26differ
39identical
41known for one product only

Key differences

Total installed storage capacity
- TS-251+ NAS Tower Intel® Celeron® DDR3L:4 TB
- TS-451-4G, 8TB:8 TB
Number of storage drives supported
- TS-251+ NAS Tower Intel® Celeron® DDR3L:2
- TS-451-4G, 8TB:4
RAID levels
- TS-251+ NAS Tower Intel® Celeron® DDR3L:0, 1, JBOD
- TS-451-4G, 8TB:0, 1, 5, 6, 10, JBOD
Processor frequency
- TS-251+ NAS Tower Intel® Celeron® DDR3L:2 GHz
- TS-451-4G, 8TB:2.41 GHz
Processor cores
- TS-251+ NAS Tower Intel® Celeron® DDR3L:4
- TS-451-4G, 8TB:2
Product colour
- TS-251+ NAS Tower Intel® Celeron® DDR3L:Black
- TS-451-4G, 8TB:White
Fan diameter
- TS-251+ NAS Tower Intel® Celeron® DDR3L:7 cm
- TS-451-4G, 8TB:12 cm
LED indicators
- TS-251+ NAS Tower Intel® Celeron® DDR3L:HDD, LAN, Power, Status, USB
- TS-451-4G, 8TB:Yes

Side by side

Differences highlightedShow differences only

Comparison of TS-251+, TS-451-4G, 8TB
106 specifications	A QNAP TS-251+ NAS Tower Intel® Celeron® DDR3L Model TS-251+ View product	B QNAP TS-451-4G, 8TB View product
Storage4 differ
Storage drives installed	Yes	Yes
Total installed storage capacityDiffers	4 TB	8 TB
Number of storage drives installedKnown for one	2	Unknown — not stated by the source
Number of storage drives supportedDiffers	2	4
Installed storage drive type	HDD	HDD
Supported storage drive types	HDD & SSD	HDD & SSD
Storage drive capacityKnown for one	2 TB	Unknown — not stated by the source
Supported storage drive interfacesKnown for one	Serial ATA II, Serial ATA III	Unknown — not stated by the source
Storage drive sizes supportedKnown for one	2.5,3.5"	Unknown — not stated by the source
RAID support	Yes	Yes
RAID levelsDiffers	0, 1, JBOD	0, 1, 5, 6, 10, JBOD
Online RAID migrationKnown for one	Yes	Unknown — not stated by the source
Online RAID expansionKnown for one	Yes	Unknown — not stated by the source
Hot-swap drive bays	Yes	Yes
Supported file systemsDiffers	FAT32, HFS+, NTFS, exFAT, ext3, ext4	ext3, ext4, FAT32, HFS+, NTFS
Bad block scanKnown for one	Yes	Unknown — not stated by the source
Storage drive interfaceKnown for one	Unknown — not stated by the source	Serial ATA III
Storage drive sizeKnown for one	Unknown — not stated by the source	2.5/3.5"
Processor2 differ
Processor family	Intel® Celeron®	Intel® Celeron®
Processor frequencyDiffers	2 GHz	2.41 GHz
Processor coresDiffers	4	2
Memoryidentical
Internal memory type	DDR3L	DDR3L
Memory clock speedKnown for one	1600 MHz	Unknown — not stated by the source
Maximum RAM supported	8 GB	8 GB
Memory form factorKnown for one	SO-DIMM	Unknown — not stated by the source
Memory slots	2	2
Flash memory	512 MB	512 MB
Internal memoryKnown for one	Unknown — not stated by the source	4 GB
Network1 differ
Ethernet LAN	Yes	Yes
Ethernet LAN data rates	10,100,1000 Mbit/s	10,100,1000 Mbit/s
Wi-Fi	No	No
DHCP client	Yes	Yes
DHCP server	Yes	Yes
Jumbo frames support	Yes	Yes
iSCSI support	Yes	Yes
Wake-on-LAN ready	Yes	Yes
Dynamic DNS (DDNS)Known for one	Yes	Unknown — not stated by the source
Link aggregationKnown for one	Yes	Unknown — not stated by the source
Supported network protocolsDiffers	CIFS/SMB, AFP v3.3, NFS v3, FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC	CIFS/SMB, AFP (v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC
Ports & interfacesidentical
Ethernet LAN (RJ-45) ports	2	2
USB portKnown for one	Yes	Unknown — not stated by the source
USB 2.0 ports quantity	2	2
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity	2	2
Fiber ports quantity	0	0
HDMI ports quantity	1	1
Design3 differ
Chassis type	Tower	Tower
Cooling type	Active	Active
Product colourDiffers	Black	White
Number of fans	1 fan(s)	1 fan(s)
Fan diameterDiffers	7 cm	12 cm
LED indicatorsDiffers	HDD, LAN, Power, Status, USB	Yes
Cable lock slot	Yes	Yes
Cable lock slot type	Kensington	Kensington
Performance3 differ
Type	NAS	NAS
Device class	Home & Home Office	Home & Home Office
Backup function	Yes	Yes
Backup featuresDiffers	Cloud, USB drive, iSCSI LUN	Cloud
Buzzer	Yes	Yes
Noise levelKnown for one	15.4 dB	Unknown — not stated by the source
SnapshotKnown for one	Yes	Unknown — not stated by the source
Management protocolsDiffers	SNMP	SNMP, Telnet
Share folder access right managementKnown for one	Yes	Unknown — not stated by the source
Web-based management	Yes	Yes
Backup buttonKnown for one	Yes	Unknown — not stated by the source
Browser supportedKnown for one	Apple Safari 7+, Google Chrome, Microsoft Internet Explorer 10+, Mozilla Firefox	Unknown — not stated by the source
Built-in FTP serverKnown for one	Yes	Unknown — not stated by the source
Built-in iTunes serverKnown for one	Yes	Unknown — not stated by the source
On/off switchKnown for one	Yes	Unknown — not stated by the source
Remotely operatedKnown for one	Yes	Unknown — not stated by the source
Reset button	Yes	Yes
S.M.A.R.T. supportKnown for one	Yes	Unknown — not stated by the source
Security algorithmsDiffers	256-bit AES, FIPS 140-2, HTTPS, SSH	256-bit AES, FIPS 140-2, HTTPS, SSH, SSL/TLS
Share folderKnown for one	512	Unknown — not stated by the source
System logKnown for one	Yes	Unknown — not stated by the source
Universal Plug and Play (UPnP)Known for one	Yes	Unknown — not stated by the source
Multilingual supportKnown for one	Unknown — not stated by the source	Yes
Access Control List (ACL)Known for one	Unknown — not stated by the source	Yes
Software4 differ
Operating system installedDiffers	QNAP Turbo System	QNAP Turbo NAS System
Operating system versionDiffers	4.3	4.1
Windows operating systems supportedDiffers	Windows 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	Yes
Linux operating systems supported	Yes	Yes
Mac compatibilityKnown for one	Yes	Unknown — not stated by the source
Mac operating systems supportedDiffers	Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks	Yes
Server operating systems supportedKnown for one	Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016	Unknown — not stated by the source
Power4 differ
Power supply location	External	External
Power supply unit (PSU) capacityDiffers	60 W	90 W
Power consumption (typical)Differs	18.09 W	31.07 W
Power consumption (sleep)Differs	0.57 W	0.55 W
Power consumption (HDD standby)Known for one	10.56 W	Unknown — not stated by the source
AC input voltageDiffers	100 - 240 V	100-240 V
Fan voltage	12 V	12 V
Number of power supply unitsKnown for one	Unknown — not stated by the source	1
Weight & dimensions5 differ
WidthDiffers	102 mm	180 mm
DepthDiffers	219 mm	235 mm
HeightDiffers	169 mm	177 mm
WeightDiffers	1.28 kg	3 kg
Package weightDiffers	2.32 kg	4.3 kg
Packaging contentidentical
External power adapterKnown for one	Yes	Unknown — not stated by the source
Cables includedKnown for one	AC, LAN (RJ-45)	Unknown — not stated by the source
Quick installation guideKnown for one	Yes	Unknown — not stated by the source
Number of screwsKnown for one	14	Unknown — not stated by the source
Remote control includedKnown for one	Yes	Unknown — not stated by the source
Operational conditionsidentical
Operating temperature (T-T)	0 - 40 °C	0 - 40 °C
Operating relative humidity (H-H)	5 - 95%	5 - 95%
Other featuresidentical
Number of simultaneous usersKnown for one	4096 user(s)	Unknown — not stated by the source
Digital Living Network Alliance (DLNA) certifiedKnown for one	Unknown — not stated by the source	Yes

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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