Headroom to me has always meant untapped performance. If headroom to you means paper stats then whip out that pencil and have loads of fun! I don't care what megahertz speed this card or that card is running at. If a card (like Hawaii) overclocks 20% in core frequencies but only scales 7% in performance, then it has very little headroom in it. When people talk about Maxwell having tons of headroom, it is in fact related entirely to it's ability to realize massive real world performance gains from overclocking. If Maxwell's real world performance gains were paltry despite it's huge clock speed increases, no one would care or talk about how much headroom Maxwell has. HENCE the very reason people consistently say Hawaii, Tonga, and Fiji have very little headroom. I was never wrong and tried to cover nothing when I was using the same math in each and every post and was very forth coming about my reasoning and intentions.
I find it amusing how you skipped mentioning that you failed at comprehension and weren't paying attention to the numbers and figures I was using and kept thinking I was comparing an out-of-box OC 390x with a max'd OC 390x when, as I proved to you (multiple times), I wasn't. I take it you ignoring this is total admission that your rants were due to reading failure and is a sign of your unspoken apology. I accept.