Hexus has two heavyweight power supplies pit against each other in a cage match: a Corsair & an Akasa. If I were a betting man, my money would be on the Corsair.

"The majority of current midrange systems, equipped with a single graphics card, make do with a high-quality 500W PSU, but the requirement rises rather rapidly when running esoteric multi-GPU subsystems, and that's why both NVIDIA and ATI both have internal programs that certify various power supplies for differing SLI and CrossFireX setups."