renz496: true, you want to make sure to use a decent physx card, not just anything, for your dedicated card. Something too slow will perform worse with it than without it. 430 might be ok, but a x4x or x5x and above are good contenders.
Physx depends mostly on the number "CUDA cores" which to most are assigned at random since they have little to do withover all gaming performance
Reminds me why Nvidia leaves a poor taste in my mouth