I have a 4870X2 and a 4870 in tri-fire and with these drivers it's crash to desktop within a few minutes of playing BFBC2. I'm sure it's the trifire setup. Anything after 10.5 has not worked for me. Went back to 10.5 and got in a good hour of BFBC2 last night no problem. Guess it's time to upgrade these old cards...