AMD has prepared the Catalyst 11.11a performance driver for Windows XP, Vista and 7, you can download this new release over here. Included in the update are performance enhancements for Batman: Arkham City, Rage, The Elder Scrolls V: Skyrim, and Battlefield 3.
The CrossFireX issue with Skyrim hasn't been resolved yet, instead AMD decided to disable CF in this game to prevent issues with negative scaling and image quality. Terry Makedon posted on Twitter that Skyrim CF will be fixed asap in an upcoming driver update.
AMD Catalyst 11.11a performance driver features:
Batman Arkham City
Improves DirectX 11 performance for single GPU configurations
Delivers AMD CrossfireX performance scaling
Resolves a number of image / stability issues seen with the title:
Fix geometry corruption, sometimes seen in Bash TV entrance
Fix issues with Low-memory conditions on 32bit systems.
Fix issue with extreme corruption with missing textures on 32bit systems.
Fix memory leaks when deleting/reusing sync objects.
Fix hitching and pausing, especially noticeable on some Quad Core systems when doing races and Stanley Express runs.
Fix some missing shadows
Elder Scrolls Skyrim
Improves performance 2-7% on single GPU configurations
Resolve corruption seen when enabling Multi-Sample Anti-Aliasing on the AMD Radeon HD 6970 Series
Disables CrossFireX (to resolve negative scaling and image quality issues seen when CrossFireX is enabled)
AMD is continuing to work on a CrossFireX solution for Skyrim – as soon as it’s ready we’ll make it publicly available
Resolves intermittent corruption seen when playing the game at specific camera angles