If so, how does this work with AMD’s upcoming high-end Summit Ridge CPU’s? It is widely accepted that HSA does not deliver on its promise (at least under current architecture) if there is not a tight coupling of the CPU and GPU with a shared memory allocation, and also affected by latency problems with PCIe. Hence, i can buy a £300 laptop which supports HSA, but I cannot build a PC that leverages the power of my £600 graphics card and £300 CPU. Either they sort out this limitation of shared memory pool and latency over PCIe, they stick shaders on Summit Ridge, or, HSA has no part to play in their high-end offerings.
At least that is what I used to think, but perhaps I have been looking through the wrong end of the telescope.