Ok guys... I know there are alot of you out there that have tried different combos concerning ATI based GPU's with an added Nvidia card for PhysX. My issue is that I have only enough room for a card that only takes one slot. This is because the second and third PCI Express slots are CLOSE together!! I recently went crossfire with 2 HD 6870's...I want the best card for physx. What will fit? I have looked and there are alot of people saying its better to have more CUDA cores? Its all kind of confusing to me. I do know I will need both drivers and a "hack" to make it work. Thanks for any help!