The +12V1 line of the PSU powers the mainboard and SATA drives, the +12V2 line is for the graphics cards, the +12V3 line serves the CPU and PATA drives.

Unlike the previous revision’s, the cross-load diagram of this revision of the PSU looks very good. The +12V voltage exceeds the allowable limit in the top part of the diagram – it is 12.6V there – but this is not a big problem since modern computers have low consumption on the +5V and +3.3V rails (within half a hundred watts), so it is the bottom part of the diagram that presents a more practical interest to us.

And it’s all well at the bottom: the +12V voltage is very close to the nominal value (the wide green band is exactly where it should be), the +5V voltage is a little higher than necessary but doesn’t go beyond the acceptable limits, the +3.3V voltage deflects by about 2% from the nominal throughout this entire range (but as you remember, the deflection of 5% is allowable).

At a load of 650W the voltage ripple was 26 millivolts on the +5V rail, 48 millivolts on the +12V rail, 12 millivolts on the +3.3V rail. It’s all normal, the numbers are nearly two times lower the allowable peaks, so the new W0049 is head above its ill-fated predecessor from this point of view.

A T&T 8020H12C NF2 fan is installed on the internal panel of the PSU; a Thermaltake TT-8025A is on the external panel (the real manufacturer of this fan is not disclosed). Although the fans have different sizes (the former is 20mm and the latter is 25mm thick), their speeds coincide with high precision. At loads below 350W the fans are both rotating at about 1300rpm. They are not audible and the PSU is overall very quiet then. When the load is increased further, the speed of the fans grows up linearly to about 3000rpm, but considering that even SLI systems keep within a total power consumption of about 400W, you’ll have to do something unusual to fully load your W0049.

The PSU is 85% efficient at the maximum which is a very good result (but note that it is about 82% at full output power). The power factor isn’t as high as PSUs with active power factor correction usually deliver, but it is acceptable – the difference of 2% (the W0049’s 0.97 against the other units’ typical 0.99) is really negligible.

I tested the PSU with an APC SmartUPS SC 630, and the maximum load on the PSU was 380W when powered from the electricity mains and 325W when powered by the UPS battery. These are normal numbers. The PSU shouldn’t have any problems with UPSes as some other models with active power factor correction have.

And so you can see that the second revision of the W0049 has nothing to do with the first one, except for the name (which is of course strange – why didn’t Thermaltake differentiate between these power supplies more sharply?) This is a high-quality and high-power product with excellent parameters and quiet operation under a wide range of loads.

The second-revision W0049 can be a good choice even for a very powerful computer system, but do not confuse it with the first revision! You can tell them apart by the specified parameters: the newer unit has a smaller load capacity on the +5V rail and a bigger load capacity on the +12V rail.