The drivers all cause major framerate drops in company of heroes + opposing fronts (down to about 50fps), especially when scrolling down the map to view another area/unit (goes to around 20 fps).
I turned off the physix acceleration, but still get bad performance. I have since reverted to 175.19 driver & am back to 60 to 80+ fps.
I havent installed the latest directx, but got the updated one from last august installed.
This happend on a clean install on a serperate (but similar in spec) pc. both use vista x64 sp1. Mine has an 8800gts 512, the other has 9600gt, both from bfg.