Their new command processor makes the CPU less of an issue than before and in some ways unshackles it. Its actually pretty damn impressive. I dont expect the CPU to bottleneck it. See Eurogamer's article excerpt below...
However, potentially the most exciting aspect surrounding the CPU revamp doesn't actually relate to the processor blocks at all, but rather to the GPU command processor - the piece of hardware that receives instructions from the CPU, piping them through to the graphics core.
"We essentially moved Direct3D 12," says Goossen. "We built that into the command processor of the GPU and what that means is that, for all the high frequency API invocations that the games do, they'll all natively implemented in the logic of the command processor - and what this means is that our communication from the game to the GPU is super-efficient."
Processing draw calls - effectively telling the graphics hardware what to draw - is one of the most important tasks the CPU carries out. It can suck up a lot of processor resources, a pipeline that traditionally takes thousands - perhaps hundreds of thousands - of CPU instructions. With Scorpio's hardware offload, any draw call can be executed with just 11 instructions, and just nine for a state change.
"It's a massive win for us and for the developers who've adopted D3D12 on Xbox, they've told us they've been able to cut their CPU rendering overhead by half, which is pretty amazing because now the driver portion of that is such a tiny fraction," adds Goossen.
