What are the only pieces of hardware than PhsyX will not run on, and what do all these have in common? I'm not talking sound cards or SATA controllers here. All CPU's can run PhysX. Which means any PC can run PhysX. The only pieces of hardware that cannot run PhysX, are AMD based GPU's. This, does not make PhysX proprietary. It makes AMD the only one who won't run it. I didn't say "can't", mind you, but won't.
Don't be that guy.
You know full well that when people say "PhysX" here they mean "GPU accelerated PhysX".
You're the one continually talking about how amazing additional PhysX effects are, and you know full well you are talking about the ones that almost always won't run on the CPU.
In the case of Mafia 2, they will run on the CPU without having to use the GPU.
As far as "AMD won't run it", why 'won't' AMD run it? Because they are too lazy, to inept? I mean, it's not like NV deliberately block PhysX when an ATI graphics card is present, so the 'won't can't have anything to do with NV, right? I don't quite get what that comment was aimed at.
The GPU acceleration of PhysX is proprietary. Those effects which run on the GPU can also be run on the CPU, but if you want to run them on the GPU, you have to have a specific GPU type running your graphics, and others are locked out.
