Qnap SS-839 Pro specs

CPU - Intel Atom Processor 1.6 GHz

DRAM - 2GB DDRII RAM

Flash Memory - 128MB DOM

HDD - 8 x 2.5" SATA I/II HDD

HDD Tray - 8 x hot-swappable and lockable tray

LAN Port - 2 x Gigabit RJ-45 Ethernet port

LED Indicators - Status, LAN, USB, eSATA, HDD 1-8

USB - 5 x USB 2.0 port (front: 1; back: 4)
Supports USB printer, disk, pen drive, USB hub, and USB UPS, etc.

eSATA - 2 x eSATA port (back)

Buttons - System: Power button, one touch copy button, reset button

LCD panel - Mono-LCD display with backlight and buttons for configuration

Alarm Buzzer - System warning

Form Factor - Tower

Dimensions:
177(H) x 180(W) x 235(D) mm
6.97(H) x 7.09(W) x 9.25(D) inch

Weight - Net weight: 3.92kg/ 8.64 lb

Gross weight: 5kg/ 11.0 lb

Sound Level (dB):
W/o HDD installed: 35 dB
Stand by: 34.7 dB
In operation: 35.8 dB (Background: 24.9 dB)

Power Consumption (W):
Sleep mode: 25W
In operation: 34W (with 8 x 500GB HDD installed)

Temperature - 0~40˚C/ 32~104°F

Humidity - 0~95% R.H.

Power Supply - Input: 100-240V AC, 50/60Hz, Output: 220W

Secure Design - K-lock security slot for theft prevention

VGA - Reserved

Fan - 1 x quiet cooling fan (9 cm, 12V DC)