Corsair AX850 850W Power Supply
 

What I really like about the Corsair AX850 is the silent fan control technology and the results it produces. Let's face it, you're not going to get silence when used in an high end dual graphics card set up playing a round of Crysis and it wouldn't really benefit me because I usually fold when not gaming and the loudest thing I hear is my graphics card fan, a quiet power supply really wouldn't make much difference. It will benefit the gamer that likes a silent PC while at the desktop, surfing, or using productivity software and enjoys quiet while gaming on a single high end graphics card.

http://www.overclockersclub.com/reviews/corsair_ax850/