Re: PhysX Benchmarks for 280GTX
This is fairly obvious, although fanboys don't like to admit it. If you use some of the GPU's power for something else, the performance in graphics suffers. You don't see this in Vantage because the Physx test doesnt do anything major with graphics, so it can just go to town with the physics calculations.
When it comes to games however, if you're using 15-20% of your GPU's power for Physx, you're going to lose 15-20% of your graphics horsepower. I suppose as long as GPUs have way more floating point performance than CPUs, and as long as physics takes a sizeable chunk of said calculations, then it makes sense to offload the calculations there rather than the CPU. Don't fool yourself into thinking its free though.