like everyone else says, physx is pretty pointless for anything that doesn't use it. I had it for a while (9600gt) and it didn't really do anything just drew extra power ontop of my gtx 260.
I got a Ageia PhysX card in PCI-E x1 on ebay for $50. I did this because my board only has one x16 slot plus it was not very much money. I have played some games enabled with PhysX and it works, but I would not put a ton of money into it.
Anyway. Offloading PhysX from GTS250 SLI to a single 9500GT will likely decrease PhysX performance, I'd say. I don't think you need a separate card. If you really want one, a GT240 would do the trick.
I ask because IMHO physx is totally overrated and not worth the money on a dedicated graphics card to run it. Just look at the ati ppls with no nvidia physx card, they are perfectly happy with their non-physx gaming.
I had it on batman and the cobwebs tear. Like cloth! So its not only gimmicky but it doesn't work very well either. The paper flies around like real paper i.e. when you walk over it it scatters yet not all stacks of paper can be knocked over!
Its a few nitpicky extra bits for what about £100 or $ dx 11 offers more for that kind of money.
But there you go just my opinion
I would enable physx with your current setup i.e. single card and physx card and see for yourself whether u think more investment is necessary.
I don't think it's worth it unless you fold. The few games that use physx have run fine on my GTX260(though I only run @ 1440x900). I would use the money and get a better cpu or GPU.
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