Originally Posted by CaptNKILL
The processor has nothing to do with textures and rendering, thats all based on the GPU and memory bandwidth. Having a CPU thats 32bit, 64bit or 82349234bit wont change your GPUs ability to map and filter textures.
And 64bit doesnt run faster. As far as I know, it just allows more instructions to be used... if they can make something take advantage of that in a way that speeds things up, then it will run faster. But it wont help in GPU limited cases. Not one bit.
The Athlon 64 has more registers when in 64-bit mode, in 32-bit mode the extra ones are off. That is where the performance difference comes from. Due to that performance they can add in more. (although I am sure the performance would be find anyways, its also a PR type deal.)