Denver is the CPU, but maxwell generation of GPU it will be used as controller.
Seems that would probably in maxwell-generation on the GPU side small OS of its own work, and thereby resolve the draw call.
Change of use of an existing game is not required.
I heard this bs on many forum. This is only possible if they make an API for it, that work exactly this way. But running the game on the CPU, and the API on the GPU is more problematic, than just creating a Mantle alternative.