my oc'ed 920 with (2) 480 GTX's and (3) SSD's and a std. HDD plus (2) opticals and more than a dozen fans eats just over 1000 watts at full load. I'm thinking (2) giant power supplies are in order.
Newegg.com - SILVERSTONE ST1500 1500W ATX 12V 2.3 & EPS 12V SLI Ready 80 PLUS SILVER Certified Active PFC Power Supply
Newegg.com - SILVERSTONE ST1500 1500W ATX 12V 2.3 & EPS 12V SLI Ready 80 PLUS SILVER Certified Active PFC Power Supply