With strong rumours of an Xbox one slim supposedly being 40% smaller, it seems likely that the new xbox one apu will be built on a smaller node process. The problem is the 14nm requires a complete redesign on finfet transistors which AMD costed up at over a hundred million $'s so I think the only logical step down from 28nm is to 20nm which would not require a redesign. I know Nvidia / Amd skipped this node and went straight from 28m-> 14nm so there is that, and I think yields on 20nm were cited as one of the reasons yet I think this is the most likely candidate.
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