Hi.
I have also a GPU ati radeon 4870x2 card. I have the same problems as you.
i have a intel E8600 cpu.. game runs crappy as .....
Seems that the game doesn't use the gpu's the right way.
when i monitor the gpus they run at 20/30% average :mad:
Have you tried som old ati drivers ??
i will later today, hope that helps :rolleyes: