I ran crossfire on my P45, 3dmark 06 @ 1920x1200 resolution, i got 19,400 3dmarks, cpu at 3.8ghz, memory at very low 1140mhz ddr3 cas7, new memory coming tommorow, and this is with single channel 1 dimm, p45 crossfire is amazing..........played some TF2, frames went well into 150-250 area 1920x1200 8xaa 16xaf..........all i can say is ATI is back!!!!!