Support for PC (windows?) based GPU's?

I heard some rumours there is support for PC (Windows) based GPU's. Some people think it's a mistake or could be something apple removed in a subsequent update to Lion, or may disappear altogether in Mountain Lion. Anyone know anything about this? I've done a simple google search and haven't found much (but I think I'm using dodgy search terms) so if anyone has any insight in this it'd be great to hear.

Basically, I want to use a GPU with moar CUDA support for AE CS6. I do know there are already mac specific GPU's, but I already have some high end Nvidia GPU's I'd like to try out before buying another pricey GPU.

Much thanks guys.

EDIT: It should be noted that I will be of course using a Mac Pro to swap out the cards. Please don't bother giving me new mac pro specs yet, as I'm not sure if my studio plans to immediately upgrade. It's the most recent mac pro up till now.

 

Hm... NEARLY I think it's kind of on the right track, but not entirely. There are some GPU's which simply do not work correctly on Mac OS X. The article is more about mountain lion. Whereas what I've been told, is there is support in lion itself (10.7) for PC based GPU's. Drivers aren't the problem, its the actual cards themselves.

Sorry if I seem a little "NAP! You're wrong!" I do actuslly appreciate the help. But it's not on track with what I've heard...

Did what I just say make proper sense? Hope it's coming across clearly. Cheers!