AMD published the Catalyst 11.11b performance driver, you can grab it over here. This release adds CrossFire support for Radeon HD 6000 cards in Skyrim as well as CrossFire suport for Assassin’s Creed: Revelations. There are still CrossFire issues with the Radeon HD 5000 series in Skyrim though, AMD promises that these problems should be sorted out this week.
Elder Scrolls Skyrim
New in Catalyst 11.11b: Delivers AMD CrossFire performance scaling for AMD Radeon HD 6000 Series
AMD Radeon HD 5000 CrossFire support will be supported soon in an updated driver
Assassin’s Creed: Revelations
New in Catalyst 11.11b: Delivers AMD CrossFire performance scaling