Originally Posted by fateswarm
That's because the PCI-E bus is extremely slow compared to VRAM<->GPU intercommunication. The OpenGL and DirectX have been doing one thing for the last 20 years, offload more stuff to the GPU, and offload more stuff to the GPU, and guess what, let's offload more stuff to the GPU.
And because games have been improving graphics much more than AI, physics, etc for a while now.
As it gets harder to improve graphics, we'll see the CPU play a more important part in gaming.