PhysX on ATI Cards

I"m going to buy a new computer, and I’m wondering if the physics engine (since it’s based on NVidia PhysX) will work properly on an ATI card. I couldn’t really tell if PhysX is just augmenting the existing Unity physics engine, or if PhysX IS the Unity physics engine.

So does anyone know if I can still access most of the physics engine on an ATI card?

Thanks,

Physics is totally software-based, including on nVidia cards…it would certainly be mentioned if Unity wouldn’t run on most graphics cards (not to mention an incredibly boneheaded business decision–remember that Intel graphics account for a substantial percentage, it’s not just AMD/nVidia).