That you are cluless of the curves doesnt mean that everybody is cluless as well, do your homework, as for me i m talking out of real figures, no need to flood your post with assumptions that give an impression of argumentation, for instance what is the relevance of Power gating granularity when we are talking of designs working at full throughput..?..
The end result is a device whose TDP generaly scale as a square of frequency in the utilised part of the curve.
When frequency is increased voltage is increased in a square root proportion, this lead to said square law, this can be observed with Broadwell as well as with the FX for whom made the little effort to check enough reviews of decent quality.
So i m not talking of theorical cases as are doing all post that i m adressed but of real figures, for instance Broadwell need 1.148V at 3.1Ghz, 1.114V at 2.9Ghz and 0.926V at 2.2Ghz, do the maths, the power/frequency curve is about a square in function of frequency, for the FX it is even more easier to compute the number since there s also the power comsumption measurements available and they correlate totaly.
As for designs the capabilities are the same, AMD manage high frequencies without the benefit of a smaller node, so this point is irrelevant, what matters is the end result.