^ My coworker just bought a GTX 560 Ti (non 448 core) and it runs great with PhysX. He said there are still some wierd bugs with running DX11 and PhysX. They are still working on patches. He said the game dips in FPS on occasion. It's a know issue.
Just food for thought. He said it looks amazing. He sold his 6870 for the 560 Ti just to get PhysX and he said it is a totally different game with the added details that werent even there before. I'm jealous. haha