Rikimaru
Veteran
28nm is very mature. 14/16 could be more expensive (lots chips with defects). Mobile chips are smaller than console's ones and have very strict TDP limit.I expect there will be 14/16nm X1/PS4 Slim by the very latest Gamescom '17, and perhaps earlier than that, like E3. So.. I don't see the tech being too immature for a Nintendo console that will launch either in Fall '16 or, especially, Spring. '17.
20nm is being 'skipped' by AMD and TSMC because of cost vs benefits over 28nm, making all the more sense they have done the same in designing NX. If this were not the case you would be seeing 20nm X1/PS4 SoC's launch this Fall alongside, and just one generation behind, 14nm/16nm Apple iPhone 7.
People lose perspective and forget that Wii U was nothing more than a transitional solution, so it's no surprise that Nintendo went with the bare minimum of tech investment.
Samsung will be shipping 14nm Exynos in Q2 '15 and Apple 14/16nm IPhone 7 A9 in the Fall. Probably 100 million of these mobile SoC's will ship at 14/16nm before NX even launches.
Business wise there is too big of an efficiency gain at 14/16nm for Nintendo to ignore (right at the cusp of it being commercially viable) for a 20nm console below X1/PS4 performance, like some expect, that would be barely distinguishable graphically from Wii U in a child's eye.
Also why did not Microsoft use more EDRAM instead of ESRAM? Maybe nobody offered EDRAM at 28nm then. And they did not want to use daughter die.
I will repeat Wii U did not use 28nm. And I strongly think NX won't be a powerhouse. There are a lot of reasons for that.
sebbbi, I think it would be more reasonable to think AMD for console, powervr for handheld.