Very interesting indead. I didn't think Drivers made that much of a difference. It does seem as though CCC 9.x had better performance than the CCC 9.12 for the HD 4870's. The CCC 10.12a seemed to have picked up some performance for the HD 6970 card(s) and brings it on par with the GTX 580 in some games.
Like always, Great Review Wiz once again.