NVIDIA PhysX on CPU with AMD GPU - Nvidia - Graphics & Displays

I have a XFX AMD 7950 core edition, and a i7 4770k OCed at 4.2 GHZ with a CM Hyper 212 EVO, and I want to use PhysX. My question is, could I run CPU PhysX with that CPU and not burn it/lose too many frames? I noticed some of my games had this thing that s

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