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Actually, the P5B-VM has the BIOS battery right next to the open 4x slot, which effectively stops you from using any expansion slot bigger than 4x. At least as far as I can tell and have read about it. It appears as it can be fixed, by desoldering the BIOS battery and resoldering it on the back of the board, though...For s775, you can only do Crossfire.
Asus P5B-VM
Gigabyte G33M
The two best options.