Beta 3 to be exact with focus on crossfire systems, not like the 12.11 was doing something wrong. The drivers have improved GPU performance there are certain noticeable changes with adaptive and supersampling refining methods that would get you maybe 5-10% better FPS in ultra high graphics. 13.3 Beta 3 is a bit buggy, it like to override certain graphics while setting are set to use application settings preference, there are issues with occasional screen tearing and I would recommend to stay with 12.11 drivers until they fix the bugs that should be in a month or two.
Catalyst control 13.3 divers would work only on operating system
Windows 7 SP1 or higher
Windows Vista SP2 or higher