Chill Innovation CP-400P4 400W review
 

Even though this power supply is only 400W, it is equipped with two 20A 12V rails. This means that it can run 20A on both of the 12V outputs. Chill Innovation informs that one can run 380W (or 95% of the units overall capacity) on the 12V outputs. If this is calculated onto the 150W that it can run on the 3,3V and 5V outputs, it is in fact possible to draw a full 510W out of this power supply. This is pretty impressive and unique

http://www.tweak.dk/tests2.php?id=1308