also update to latest drivers 10.3 DL them here.. i got an extra 10 FPS with these drivers VS the stock ones that come with the card.. i dont know about you but im getting much better performance than you with same card and more settings maxed so maybe its the drivers ....huge jump
http://www.techpowerup.com/downloads/1763/mirrors.php
*note if you DL the 10.3 drivers here you dont need to DL CCC just the 10.3 drivers should come with upgraded CCC