Well, if you want to waste $400 dollars it would be logical, but wasting $400 isn't logical. Anything higher that a 8800GT can handle all of your Physx needs. I have heard that the best card for a dedicated Physx card is the GTX 260. The GTX 580 is NOT meant to be a dedicated Physx card, it is a card that will handle Physx, and whatever else you through at it. My recommendation is a GTX 260 for dedicated Physx.