if its 6800 GT or ULTRA go nvidia, other wise i would go ati just cuz i love ati, plus i dun care wut noone say, i like the faster clock and mem speeds of ati, course dual nvidia is nice, hmmmmmmmm lol u ask hard questions, i kno! wait till ati comes out with sli .... untill then just get something that dun cost 800 bux but is still good, also, i dun know anyone that can actually use the sli cards to their limit anyways, go with the cheaper i would say