IMO 25-30 FPS while moving is not terrible lag, i run about the same FPS as you, 35-30 while moving, and around 90-100 standing still in certain spots, as far as FPS goes other games, farcry 2, COD games like that i hit 50-60 FPS, i seems wow eats up my fps more than any other game, but even running at 30fps while i play wow it runs smooth and looks great. wow seems to be oen of the only games that runs low fps but looks great, one thing i might recommend if you want to tweak your graphics a little to get better FPS download nHancer
nHancer - Advanced Control Panel for nVidia Cards
you could also try uping your AA (if you havnt already)
another thing to check is some bio's also give you options to tweak your PCIe slot



























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