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I'll wait till ATI get off their arses and update their links!
Well for what its worth, going from previous latest to 9.1's i gained about the following:
WoW - 12fps
TF2/Source engine games - 5 FPS
Crysis - 7fps
Grid - 9fps
Probably down to the 'Multi threading' change moreso then anything else i guess.
all i managed to test so far, all dx9 too btw since im running xp
-edit-
4850 Crossfire setup.