Three important things here:
1. Crysis 2 dips a bit lower with all 12.6 Beta drivers than with 8.97 April 18.
2. DiRT 3 DX11 is now performing as it should, previous two 12.6 BETAs were giving ~25% FPS than any other driver.
3. Skyrim gets a rather big boost in performance, about 10% but from what I read, CF flickering issue has not been fixed.