I was having all kinds of issues getting crossfire to work correctly. Even after formatting and trying with a fresh install of windows then flipping the cards positions. The issues I was having where gpu and memory clocks not stepping up under load plus low gpu usage. As soon as I oced with afterburner everything worked perfect. I went from 45 fps in BF3 to 95. So I would strongly recommend anyone with issues to try ocing with afterburner. I oced both cards to 1050/1400.
Brock
Brock