QNAP TS-251-4G, 4TB vs QNAP TS-251, 4TB

Comparison of TS-251-4G, 4TB, TS-251, 4TB

69 specifications	A QNAP TS-251-4G, 4TBView product	B QNAP TS-251, 4TBView product
Storageidentical
Storage drives installed	Yes	Yes
Total installed storage capacity	4 TB	4 TB
Number of storage drives supported	2	2
Installed storage drive type	HDD	HDD
Supported storage drive types	HDD & SSD	HDD & SSD
Storage drive interface	Serial ATA III	Serial ATA III
Storage drive size	2.5/3.5"	2.5/3.5"
RAID support	Yes	Yes
RAID levels	0, 1, JBOD	0, 1, JBOD
Hot-swap drive bays	Yes	Yes
Supported file systems	ext3, ext4, FAT32, HFS+, NTFS	ext3, ext4, FAT32, HFS+, NTFS
Processoridentical
Processor family	Intel® Celeron®	Intel® Celeron®
Processor frequency	2.41 GHz	2.41 GHz
Processor cores	2	2
Memory1 differ
Internal memoryDiffers	4 GB	1 GB
Internal memory type	DDR3L	DDR3L
Maximum RAM supported	8 GB	8 GB
Memory slots	2	2
Flash memory	512 MB	512 MB
Networkidentical
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
Supported network protocols	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 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
Designidentical
Chassis type	Tower	Tower
Cooling type	Active	Active
Product colour	White	White
Number of fans	1 fan(s)	1 fan(s)
Fan diameter	7 cm	7 cm
LED indicators	Yes	Yes
Cable lock slot	Yes	Yes
Cable lock slot type	Kensington	Kensington
Performanceidentical
Type	NAS	NAS
Device class	Home & Home Office	Home & Home Office
Backup function	Yes	Yes
Backup features	Cloud	Cloud
Buzzer	Yes	Yes
Multilingual support	Yes	Yes
Management protocols	SNMP v2 & v3	SNMP v2 & v3
Web-based management	Yes	Yes
Access Control List (ACL)	Yes	Yes
Reset button	Yes	Yes
Security algorithms	256-bit AES, FIPS 140-2, SSH, SSL/TLS	256-bit AES, FIPS 140-2, SSH, SSL/TLS
Softwareidentical
Operating system installed	QNAP Turbo NAS System	QNAP Turbo NAS System
Operating system version	4.1	4.1
Windows operating systems supported	Yes	Yes
Mac operating systems supported	Yes	Yes
Poweridentical
Power supply location	External	External
Power supply unit (PSU) capacity	60 W	60 W
AC input voltage	100-240 V	100-240 V
Fan voltage	12 V	12 V
Weight & dimensionsidentical
Width	102 mm	102 mm
Depth	225 mm	225 mm
Height	168.5 mm	168.5 mm
Weight	1.28 kg	1.28 kg
Package weight	2.32 kg	2.32 kg
Packaging contentidentical
External power adapter	Yes	Yes
Operational conditionsidentical
Operating temperature (T-T)	0 - 40 °C	0 - 40 °C
Operating relative humidity (H-H)	5 - 95%	5 - 95%
Other featuresidentical
Digital Living Network Alliance (DLNA) certified	Yes	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.