QNAP TS-659 Pro vs TS-639Pro
QNAP 6 Bay NAS TS-659 Pro TS-659 Pro TS-639 Pro
Model Name TS-659 Pro+ TS-659 Pro TS-639 Pro
Target Customer Business Users Business Users Business Users
CPU Intel® Atom™ 1.8 GHz (Dual-Core) Intel® Atom™ 1.66 GHz (Dual-Core) Intel Processor 1.6 GHz
Flash 512MB (DOM for dual OS) 512MB (DOM for dual OS) 128MB (DOM for dual OS)
RAM 1GB RAM 1GB RAM 1GB RAM
LCD Display Yes Yes Yes
Touch-N-Go LCD Setup Yes Yes Yes
Hot-swappable Yes Yes Yes
Ethernet w/ Jumbo Frame GigaLAN x2 GigaLAN x2 GigaLAN x2
USB 2.0 port x5 x5 x5
eSATA x2 x2 x2
VGA (for maintenance) Yes Yes Yes
NFS, SMB/CIFS, AFP Yes Yes Yes
Max IP Cameras Supported x4 x4 x4
Internal HDD Support SATA I/II (2.5" & 3.5") SATA I/II (2.5" & 3.5") SATA I/II (2.5" & 3.5")
RAID 0/1/5/6/5+Spare/JBOD/Single/ Expansion/ Migration/ RAID Recovery Yes Yes Yes
AES 256-bit Volume-based Encryption Yes Yes Yes
iSCSI Target Service Yes (Up to 256 targets) Yes (Up to 256 targets) Yes  (Up to 256 targets)
VMware Certification Yes Yes No
SPC-3 for clustering, LUN Masking & Mapping, MC/S, MPIO Yes Yes Yes
Wake On LAN Yes Yes Yes
Max User Accounts 4096 4096 4096
Max Groups 512 512 512
Max Shared Folder 512 512 512
Concurrent Connections 256 256 256
SMB* (MB/sec) Read: 115.5 Read: 115.5 Read:  107.2
Write: 103.4 Write: 100.6 Write: 68.9
FTP* (MB/sec) Read: 115 Read: 113.7 Read: 109.4
Write: 102.4 Write: 98.2 Write: 68.5
Power Consuming(W)* Sleep mode: 22 Sleep mode: 22 Sleep mode: 29
In operation: 43 In operation: 43 In operation: 43
Sound Level * W/o HDD installed: 35.7 dB W/o HDD installed: 35.7 dB W/o HDD installed: 34.1 dB
Stand by: 35.2 dB Stand by: 35.2 dB Stand by: 34.2dB
In operation: 40.8 dB In operation: 40.8 dB In operation: 38.2 dB
(Background: 25.5 dB) (Background: 25.5 dB) (Background: 25.5 dB)
*Testing results may vary in different system condition
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