Simply put, what AMD's heterogeneous Uniform Memory Access (hUMA) does is allow central processing units (CPUs) and graphics processing units (GPUs) – which AMD places on a single die in their accelerated processing units (APUs) – to seamlessly share the same memory in a heterogeneous system architecture (HSA). And that's a very big deal, indeed.
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In fact, hUMAfication already appears to be on the way – and not necessarily where you might have first expected. AMD is supplying a custom processor for Sony's upcoming PlayStation 4, and in an interview this week with Gamasutra, PS4 chief architect Mark Cerny said that the console would have a "supercharged PC achitecture," and that "a lot of that comes from the use of the single unified pool of high-speed memory" available to both the CPU and GPU.