You could do what I always do. Put it in a box, and put it on a shelf. Then in 5 years, you'll wonder why you kept it, but it will be much easier to get rid of. Or you could just sell it now, and use it for the next upgrade.
So I should upgrade cpu and motherboard first so I can get more pc expandiblity to do other things anyone have suggestions on good processiors 350 and other and what are good cheap motherboards any suggestion thanks for responses
Upgrading, building new is always a good idea if funds permit. But to do so just to use an old GTX 650 Ti as a PhysX card is kinda foolish IMO. And it will only work in SLI with another GTX 650 Ti of similar specs.