As it turns out it's a dedicated Directx 12 "draw call processor"
mitch074 has weighed in on this, in the Vega thread with this info...
"What AMD and Microsoft did (AFAIKT) was improve the CPU's instruction decoder so that when a game makes use of DX12, the decoder catches DX12 calls and provides dedicated instructions and/or pipes draw calls directly to the GPU. This, I guess, sidesteps the need to decode the instruction in-CPU then route it to the GPU, instead the instruction decoder sends it to the GPU directly. This can easily save a dozen cycles or more per draw call."
That sounds amazing, excellent stuff.. This is a forward looking move for sure.. Dx12 is capable of a record amount of draw calls compared to any of the previous directx API's.. An according to AMD in 2017 we will have 3 times the amount of Dx12 games developed and 3 times the amount of VR headsets sold.
This certainly sounds like something that would benefit us on our graphics cards in the future.
Edit: More info on this "GPU Command Processor" this is what MS is calling it:
"What’s more interesting about the Scorpio console is that, according to Microsoft, it’s designed to incorporate basic, oft-used DirectX12 draw calls into the GPU command processor itself, potentially freeing up some processing power for devs."
“It's the first time I'm aware of us ever doing something like this,” Gammill said. “We actually pulled some of the DX12 runtime components directly into the hardware. So basically, these high-frequency DX12 draw calls you'd normally call [to output a frame, for example] which would take up a lot of GPU and CPU cycles, now that that's baked into the system itself, it makes the system significantly more efficient.”
Gammill estimates this can lead to situations where hundreds of specific API calls can be cut down to 10-15, potentially giving developers a bit of extra efficiency to play with.
Significantly more efficient ! The full article can be read here:http://www.gamasutra.com/view/news/295800/Inside_the_next_Xbox_Project_Scorpio_and_its_brandnew_dev_kit.php
I wonder is this some of AMD's secret sauce... maybe it this will be incorporated into the GPU Command Processor in Vega !