I did have a crossfire setup, recently just sent back one of my cards (XFX 6870) because it was crashing my drivers and getting stuck at 99% load idle. But I noticed after setting up crossfire it took a lot longer to load games, I was comparing it with a mate over teamspeak. Anyway since I've taken the card out my games load a lot faster now.. and there is hardly any difference in fps to be honest. Faulty card most probs.