AMD is cranking out new beta drivers at an ever increasing pace. The company just released the Catalyst 13.11 beta 7 driver, you can download it over here. The new release promises a 20% performance increase in Battlefield 4 when using CrossFire.
Feature Highlights of The AMD Catalyst 13.11 Beta7 Driver for Windows
?Includes all Feature Highlights of the AMD Catalyst 13.11 Beta6
Increases AMD CrossFire?™? scaling up to an additional 20% for Battlefield 4