[zomg]

I'm not sure how people get the idea that PhysX on CPU is poorly implemented.

Did it ever occur to you, that the tech put into Nvidia GPUs comes from Ageia's card, which was specifically developed to run physics code fast. A processor specifically developed for a single task is much more efficient at it than a general purpose processor like a CPU. This is also why we have distinct GPUs.

So could it be, that because of the advanced physics enabled by the parallel processing power of the GPU and the Ageia tech, it actually allows it to run comparatively better physics models?

And now with that, since CPUs aren't as efficient with parallel processing as GPUs, we can directly draw a parallel to why it would perform poorly on a CPU. Not because of bad drivers, but because of simply the fact that the CPU isn't good enough for it.

So basically, get a better CPU or an Nvidia card.

Feel free to provide reliable facts about PhysX being poorly implemented, and that being the cause, rather than what I said here. I doubt you can.