notguru

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What is a PhysX card? Do I need 2 GPU slots in my mobo?
I have a GTS 250 currently, but if I buy a GTX 295, what would be the benefits of me using the 250 as my PhysX card?
 
PhysX was a software for emulating realistic physics(liquids, cloth, destruction, ect) in games. There was also a hardware card to accelerate it.

Nvidia bought the company(Funny as they said they where working on there own hardware physics with video cards and basically told users it was a waste and to just wait for them. ATI said the same thing. Funny since in the end they just bough them out for something they told users not to get....funny but true.) and is now running the hardware portion on there CUDA platform. You can use a GTX 250 or even an older card that uses less power for that(8600 9400 ect). The 295 will run the games and PhysX as well on there own as will most new Nvidia cards with at least 256MB of memory.
 

notguru

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So if I have a GTX 295, I do not need another video card?
 

The GTX 295 is already 2 cards. So there will be plenty of power left over to do the PhysX work. If my old 8800GTX can do it...the 295 can do it BETTER :p
Have fun.