Tej’s Tech Blog has a post on installed an NVIDIA GTX 570 PC card into a MacPro and it seems to work except for EFI (so it goes straight to desktop or login screen, you don’t see the spinning ball at the start. Guess you can’t do safe mode or boot to another drive then from startup, though not positive on that).
You will have to do some Terminal tricks to get the Adobe suite to see it as compatible as the card is not listed for Mac, but it can be done.
This is great news. Wonder if NVIDIA is going towards one driver for all their cards, or if it means that Apple is planning to include NVIDIA if and when it ever updates the MacPro?
No matter what, more NVIDIA support for Macs is a good thing. And it is great that the new MacBook Pro and the MacBook Pro Retina are run by NVIDIA cards, as more CUDA support means more realtime with the Adobe Suite.