said by Octavean:
If PhysX is enabled, I don't think PhysX games do very well without dedicated hardware. I was unaware the Intel iGPU was supported in this capacity.
You might be right. It's probably the CPU portion that handles it.
Either way, games with PhysX absolutely need a dedicated GPU.
I couldn't imagine how bad it would have run if I was using the onboard HD4000 graphics.