Just curious if anyone knows if its possible to get them running with that, I know a 1200W will work fine.
not posible
maximun demand on the 6990 is 294W per card.
and u still need the power for the cpu/ram/mobo
you could do it with 2 psus. one 850w for mobo+2gpus and one 650w for the other 2gpus. this way u can save arround 50 bucks.