Put a pair of ATi + NV card with similar performance. Crossfire will win.
4850 is similar performance to a 8800GT and guess which dual configuration works out of those two![]()
3870 is around the same performance as a 9600gt, and the 9600gt in sli hammered the 3870 crossfire solution. let me go find those benches again, i think its on the guru3d website.