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I think that someone told AMD that, they tried to meet that target with things like high-level software to design microarchitecture, and the result was Bulldozer.I think that a new microarchitecture costs a lot less than the multibillions you suppose
Then again, I think a partial microarchitecture redesign costs less than a full redesign like Bulldozer. And I don't think Intel has had a successful full redesign since...Pentium Pro? PII and PIII were partial redesigns, P4 was a bust, and PM and Core continued on from PIII. Unless Core 2 was a full redesign? I think the rest have been partial, incremental redesigns from Core 2.