AMD has released a new Catalyst 13.5 Windows Beta Driver

Feature Highlights of the AMD Catalyst 13.5 Beta Driver for Windows

Performance gains seen on the entire AMD Radeon HD 7000 Series for the following:
Far Cry 3: Improves performance up to 4% with Anti-Aliasing enabled
Shogun II: Improves performance up to 20% with 8x Anti-Aliasing enabled
Tomb Raider: Improves performance up to 6%
Bioshock: Improves performance up to 6%
Borderlands 2: Improves performance up to 17%
Corruption is no longer seen on the AMD Radeon HD 7790 when TressFX is enabled in Tomb Raider

  AMD Catalyst 13.5 Windows Beta Driver