It's literally a slideshow with physX on without an Nvidia card. Same at Arkham Asylum.
If they bothered to make a driver for them a modern CPU would have no problem doing those calculations. But that's Nvidia for you I guess.
Well that makes no sense, when people use PhysX in Borderlands 2 for example, they have reported some slow downs, even with high end nVidia cards, so how are nVidia supposed to cater for it on a 4/6 or even 8 core CPU and why should they?