Testing
For testing power supplies, we get together the most power hungry of all our hardware, get it all plugged in and then test the rail's outputs at idle and at load to check their stability. However, since this PSU is rather large in it's wattage, we decided to use our hillbilly testing setup. This involves placing our AM2 and Conroe systems very near each other and having the Olympia not only powering the entire C2D rig, but also the GPU, hard drives, CD drives and all fans from the AM2 rig.

Testing is performed using Asus Probe. A multimeter is used to check accuracy of readings.

The pieces of hardware that the Blue Storm II 500w powered were:

Core 2 Duo E6600 @ 2.7ghz
Asus P5W DH Deluxe
MSI 8800GTS
x1950 Pro 512mb
2gb OCZ Special Ops. Urban Elite @ 900mhz
1x 36gb WD Raptor
2x 80gb WD Caviar SE
2x LG CD/DVD Writer combo.
3x 120mm Noiseblocker fans
2x 120mm Akasa fans

Results

As you can see from the results the 5v and 3.3v rails stay relatively tight throughout testing. However, the 12v rails deviate from their idle voltage by 0.1 of a volt when under load. This is far from horrendous, but for a PSU of this cost I would expect better. Also, the 12v rail is 0.4 of a volt from the perfect 12.0; I have seen much better results from other similarly priced PSUs.

Noise

The Epsilon is a nicely quiet power supply. The 120mm fan spins slow enough to keep the noise levels to a minimum but still fast enough to keep the hot air pumping out.

Cost

Going for about £100 the Epsilon is far from cheap. However, it's rails are relatively tight and stable and this may make the purchase worth it.