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Comparison of QNAP HS-251+ and ZyXEL NAS542

The side-by-side comparison of the devices’ specifications. The comparison table below makes it easier to choose the most fitting NAS.

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Adding/changing a NAS
QNAP HS-251+ (HS-251P)
QNAP HS-251+ (HS-251P)
ZyXEL NAS542 (NAS542)
ZyXEL NAS542 (NAS542)
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Launch 2015 2016
Class Small office / Home office Small office / Home office
Body
Dimensions 41.3 x 302 x 220 mm 190 x 225 x 160 mm
Weight 1.56 kg 2 kg
Disks
Disk bays 2 x 3.5" SATA III 4 x 3.5" SATA II
RAID JBOD
RAID0
RAID1
JBOD
RAID0
RAID1
RAID10
RAID5
RAID6
SSD support yes no
Network
LAN ports 2 x Gigabit Ethernet 2 x Gigabit Ethernet
Wireless no no
Protocols AFP
CIFS/SMB
FTP
NFS
SFTP
AFP
CIFS/SMB
FTP
HTTP
ISCSI
NFS
WEBDAV
P2P support no BitTorrent
Media server DLNA
UPnP
iTunes
DLNA
Squeezebox
UPnP
iTunes
Cloud backup Amazon S3
Box
Dropbox
Google Drive
Microsoft OneDrive
Dropbox
Google Drive
Connectivity
USB ports 2 x USB 2.0
2 x USB 3.0
3 x USB 3.0
eSATA ports no no
System
CPU Intel Celeron J1900 quad-core @ 2 GHz Freescale ARMv7 Cortex-A9 dual-core @ 1.2 GHz
RAM 2 GB DDR3 1 GB DDR3
Flash 512 MB 256 MB
Operating system QNAP QTS ZyXEL
Alternative OS
Power
Power supply 12 V / 5 A 19 V / 4.74 A
Consuption 15.8 W / 7.1 W 36.5 W / 14.8 W
Fans fanless 1 x 120 mm
Noise level 6.5 dB(A)
Features
Specials HDMI output
Failover and link aggregation
Infrared receiver
Failover and link aggregation
SD card reader
Administration
Default IP DHCP DHCP
Default username admin admin
Default password admin 1234

A maximum of 3 devices can be compared at the same time. To add or change a NAS, type the name of the NAS you’re looking for in the search field of the table’s column, then click on the device’s name in the drop-down list of search results.

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