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We know how Sony has achieved its performance target - it is almost certainly utilising the AMD Polaris 10 graphics core, using 36 next-gen GCN compute units clocked at 911MHz. Essentially, it is a downclocked version of the Radeon RX 480 graphics card - AMD's upcoming $199 next-gen GPU, aimed squarely at the mainstream gamer while also offering good, entry-level VR capabilities. We can be fairly sure that this GPU is a cut-down version of a yet-to-be-seen product, quite possibly one with 40 compute units. By leaving a portion of the CUs deactivated, imperfect chips can be used from the production line - it's a tactic used on both PS4 and Xbox One, both of which have two offline CUs on the silicon.
However, based on the differential in spec between Neo and Scorpio, it's unlikely that the new Microsoft console uses Polaris at all. A 40 CU part would need a mighty overclock to hit 6TF, and based on the rendered imagery we've seen, the heating assembly planned for Scorpio looks a little lacklustre. With that in mind, our money is on a downclocked version of AMD's upcoming Vega technology.
Thanks to an AMD engineer rather unwisely posting a partial spec for Vega on his LinkedIn profile (!) we know that the fully enabled processor features 64 compute units. Assuming that this is cut down to 56 CUs (as in the Radeon R9 Fury, a pared back version of the 64 CU Fury X), a clock speed in the 830-850MHz region looks likely. Alternatively, and perhaps more likely, we could be seeing 60 CUs at 800MHz. Both represent a substantial increase over PlayStation 4K Neo, while the raw increase to performance over PS4 and Xbox One is obviously much larger.
Edited by G-DannY, 14 June 2016 - 14:02.