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Review: HEXUS PSU (Power Supply Unit) Roundup - Taoyuan 2005

by Ryszard Sommefeldt on 23 September 2005, 00:00

Tags: Aopen, Enermax (8093.TWO), Zalman (090120.KQ), Akasa, Thermaltake (3540.TWO), OCZ (NASDAQ:OCZ), Tagan, SilverstoneTek, FSP Group (TPE:3015), Hiper, ETASIS

Quick Link: HEXUS.net/qabkp

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Enermax EG701AX-VE & QTec Triple Fan 650W

Enermax EG701AX-VE

Retail Name (if known)Enermax Noisetaker 600W
Rated Output Power600W
SpecificationATX 2.0
Power SwitchYes
Input Voltage110-240V, 50-60Hz
Fan(s)80mm, 92mm
Cable runs24-pin EATX with split
8-pin EPS with convertor
2 x 4-pin Molex, 1 floppy
2 x SATA
2 x SATA
2 x 4-pin Molex, 1 floppy
3 x 4-pin Molex
Max currents+3.3V = 34A
+12V = 18A + 18A
+5V = 34A
Combined power for +3.3V and +5V130W
Passed certification checksYes (CB, Taiwan, passing IEC 60950. CE, Taiwan, passing EMC Directive)

The Noisetaker 600W suffered the same problems that the previous Enermax did. Anything over a ~120W combined load on +3.3V and +5V would cause the PSU to shut down. That left ~480W to find just from +12V. Will only 36A, that's impossible. The supply only managed to add another 340W to that 120W imposed limit using the +12V rails, stopping at 460W. Dropping back off of the 120W combined load to see if +12V could go further than around ~28A showed no extra headroom. Just over 27A combined is all the PSU can do.

It seems that the 600W quoted is merely a short-burst peak power. No amount of adjustment could persuade the supply to output more. At 460W efficiency was high and it wasn't very hot, but it didn't make the output power it claimed to be able to do, so it was classed as a failure. The supplied EPS to P4&P4+ convertor is a nice touch.

Recommended system: Mid-range to high-end desktop systems based around P4 (including high-speed Prescott), AMD Athlon Socket A and AMD Athlon 64 and Sempron on Socket 754 and Socket 939 but only if fully observing the ~460W limitations and especially the 27W limit for +12V. That's enough for all current NVIDIA SLI however, and a powerful CPU. Server systems due to EPS.

QTec Triple Fan 650W

Total shite
Retail Name (if known)QTec Triple Fan 650W
Rated Output Power650W
Power SwitchYes
Input Voltage220-240V, 50Hz
Fan(s)2 x 80mm, 120mm
Cable runs20-pin ATX
half AT
3 x 4-pin Molex, 1 floppy
3 x 4-pin Molex, 1 floppy
Max currents+3.3V = 30A
+12V = 25A
+5V = 45A
Combined power for +3.3V and +5V325W

QTec's Triple Fan 650W is clearly a joke power supply. From the triplet of cooling fans that battle against each other to cool very little, to the supposed ratings that don't even add up to 650W, finishing with the massive failure for the PSU to get anywhere near its rated output. At 350W the outputs started to fluctuate rapidly before settling down.

By 450W, efficiency was dropping like a stone, input power increasing at a very rapid rate. At 50% efficiency and 900W of input power with the PSU making a horrible screeching sound, PD and I stood well back and recorded its demise on video. At 1100W of input power (1.1 kilowatts), it popped with a massive bang, the internal fuse letting go in impressive style.

For its rediculously low cost, the QTec Triple Fan 650W can only be described as a clown's supply. Buy at your own peril and don't say we didn't warn you. The worst supply on test by quite some margin and a complete misadvertisement of capabilities, suckering people into a poor purchase.

Recommended system: None whatsoever.