I think the game (frames per second) is being limited on purpose, to show you that you "need" the physx card..
now i thought THAT was odd enough...but wait, ther's more...
to be absolutely sure, i maxed the grafix out, and yep, it ran the same (crappy that is) but it does look pretty awesome, too bad they screwed it up pretty bad...
anyway, i have an Athlon xp 64 X2 Dual Core 4800+
2 gigz of ram, SATA 320 HDD and the 8800gts 640mb
message me if you have any questions.
Greets, Lynk