QNAP TS-439Pro/2TB Tower vs QNAP TS-439Pro/4TB Tower

Comparison of TS-439Pro/2TB, TS-439Pro/4TB

23 specifications	A QNAP TS-439Pro/2TB Tower Model TS-439Pro/2TB View product	B QNAP TS-439Pro/4TB Tower Model TS-439Pro/4TB View product
Storage1 differ
Total installed storage capacityDiffers	2 TB	4 TB
Number of storage drives supported	4	4
Storage drive interface	Serial ATA	Serial ATA
Storage drive size	3.5"	3.5"
Processoridentical
Processor frequency	1.6 GHz	1.6 GHz
Memoryidentical
Internal memory	1 GB	1 GB
Internal memory type	DDR2	DDR2
Flash memory	128 MB	128 MB
Ports & interfacesidentical
Ethernet LAN (RJ-45) ports	2	2
USB 2.0 ports quantity	5	5
eSATA	Yes	Yes
Designidentical
Chassis type	Tower	Tower
Number of fans	1 fan(s)	1 fan(s)
Poweridentical
Output power	250 W	250 W
Weight & dimensionsidentical
Weight	3.65 kg	3.65 kg
Operational conditionsidentical
Operating temperature (T-T)	0 - 40 °C	0 - 40 °C
Operating relative humidity (H-H)	0 - 95%	0 - 95%
Other featuresidentical
Compatible operating systems	Windows 2000/XP/Vista/7/Server 2003/2008, Mac OS X, Linux, Unix	Windows 2000/XP/Vista/7/Server 2003/2008, Mac OS X, Linux, Unix
Dimensions (WxDxH)	180 x 235 x 177 mm	180 x 235 x 177 mm
Fan	90mm	90mm
Link/Act LED	Yes	Yes
Power requirements	100 - 240V	100 - 240V
Connectivity LEDs	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.