I'm building a computer for a friend and this is all in his best interest when it comes to price and performance because he's a gamer. I was wondering if two GeForce 6600GT 128mb GDDR3 cards would over power a single 6800GT 256mb GDDR3 card. I don't have any experience with dual video cards so if any one knows anything about what I'm asking, I'd appreicate the knowledge.