I would go for something from the 200 series for physx, but I believe everything in the 8000 and 9000 series will also do physx. You don't need anything too intense, I think the GTS 250 would be plenty.
If you want my honest opinion, I don't think physx is worth it yet. It is a really cool technology, but not many games support it yet. When more games start to support it, then it will be a really cool feature to have. I would recommend saving your money until there are more physx games.
GTS 250 would be plenty.
nVidia said:GeForce 8-series GPUs and later (with a minimum of 32 cores and a minimum of 256MB dedicated graphics memory) support PhysX.
nVidia said:Can I use an NVIDIA GPU as a PhysX processor and a non-NVIDIA GPU for regular display graphics?
No.
There are low-end 200-series cards too, you know.Let me get this straight lol you're telling him to go buy a card that's better than his current one just for physx?It would be smarter to just get a cheap 8-9 series card for that