AMD says the Vista versions of the drivers bring OpenGL support as well as other enhancements to Radeon X1000-series CrossFire configurations. Namely, the drivers enable the Alternate Frame Rendering CrossFire mode by default, which improves performance for AFR-compatible apps that aren't officially profiled by AMD's multi-GPU technology. AMD claims the new drivers offer performance gains of at least 12.5% for all Radeon X1000 CrossFire setups in Dark Messiah of Might & Magic, as well, although those gains apply to both Vista and XP. AMD's high-end cards reportedly see gains of 60% or more in the game.
On the bug fixes front, AMD says the Vista versions of the drivers fix bugs in 3DMark 2006, Call of Duty, Call of Duty: United Offensive, City of Heroes, Doom 3, NBA Live 07, Neverwinter Nights, and Neverwinter Nights: Shadow of the Undrentide. No major game fixes are listed for the Windows XP release. However, a complete list of bug fixes and changes for both XP and Vista versions of the drivers is available here.