AMD uploaded the Catalyst 13.3 beta driver, you can download it over here. This new release enhances performance in SimCity and Far Cry 3, it also fixes some latency issues in Tomb Raider and Hitman Absolution, as well as a minor corruption issue in Tomb Raider with TressFX turned on.
Feature Highlights of the AMD Catalyst™ 13.3 Beta Driver for Windows:
Improve performance in Sim City 5 up to 16 percent
Improves performance in Far Cry 3 up to 5 percent
Improves latency performance issues seen in Tomb Raider and Hitman Absolution
Resolves slight corruption seen in Tomb Raider with TressFX enabled for CrossFire and single GPU configurations