Did you happen to see my post above where I link the CEO of TSMC saying there won't be 20nm this year? 12 days ago?
What AMD does is irrelevant at this point, unless they plan on making Hawaii a 28nm part. My guess is Hawaii was designed to be 20nm, and would require some re-engineering to do on the larger process. (but I'm not en engineer) Would seem to me there would be power and speed sacrifices to that and that all important first impression of their new arch might be tarnished by such a move.
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