Uh so maybe I should have posted this almost a year ago. Sometime around Catalyst 12.3, the framerate in Battlefield Bad Company 2 and Medal of Honor 2009 took a severe hit. I am not sure if Need for Speed: The Run (the other frostbite engine game) took a hit.
As usual, the fix is simply placing an older driver dll into the game folder if you want to keep a newer set for the rest of the system. You’ll need aticfx32.dll and atidxx32.dll if you play in DirectX 10 (why wouldn’t you be anyway?).
Refer to my instructions on how to extract driver dll files from installers.
