I'm thinking about putting an old nVidia card in my Mac Pro for PhysX under Windows 7. Theres a way detailed on the AMD forums to get a PC to use a AMD card as graphics and a nVidia card just as Physx in the one machine. While this should all be fine to do in a Mac Pro under Windows 7, what happens when I reboot and go back into OSX? Would OSX ignore the old nVidia card or would there be some kind of conflict? I'd like to try this out for a bit of fun and seeing what a Mac Pro is really capable of, but if it will cause problems for OSX I won't do it.