There is nothing WRONG with it.... But you can do better for the same or just a little bit more... that's all we are saying...
9600 GT 512 SLI performs better then 8800 GT 512 SLI for some reason... The cards 1 v 1 themselves though don't really compare... the 8800 gt blows it away.
Dont 9 series card's use newer drivers too? Maybe that really helps out SLI performance