For the millionth time, people on low budget will be GPU limited the majority of the time.
People with budget GFX cards won't be running on Ultra GFX settings anyway if it meant a ridiculous 10-12fps slide-show (as your AC:Unity chart shows for an R7 260X) vs 30-50fps by turning settings down to High / Medium / Low rendering most of your 'VHQ' graphs somewhat moot...
Ok lets clear this once and for all, we were talking about OVERCLOCKING
Yes, and go look at absurd power consumption of an OC'd FX-8350 (up to +200w excess):-
http://www.bit-tech.net/hardware/2012/11/06/amd-fx-8350-review/7
http://techreport.com/review/23750/amd-fx-8350-processor-reviewed/13
Even for the "E" chips :
"The obvious price to pay for the combination of extra voltage and frequency is increased power consumption. System-wide HandBrake power draw increases from 137W to a huge 288W" (meanwhile the i5 remains at 88-92w for still better performance)
http://hexus.net/tech/reviews/cpu/74109-amd-fx-8370e-95w-32nm-vishera/?page=10 (pages 9-10)
Price in +$30 for a decent aftermarket air cooler to deal with that surplus heat (if not +$50 for water-cooling) + higher energy costs (average energy prices now $0.14 USA / $0.20 Europe per kwh, ie, +$30-$45 over typical 3-yr CPU lifespan for
each 1hr full load per day), + possible PSU upgrade (for those with existing 400w units) + the annoyance of faster & louder case fans, etc, and I really wouldn't want a +200w "space-heater" from either brand even if 8-core CPU prices were slashed to $10 (for the same reason I happily bought a 67w Athlon64 over a 115w Prescott P4 and wouldn't have changed my mind even if Intel had given away Pentium 4's for free in a packet of corn-flakes...)
This has all been done to death so many times before. AMD's have some good bargains especially in the budget area. But even with budget buyers, "the last dollar" by itself isn't the be all and end all of everything. The reason so many are willing to pay a premium for Intel is pretty much the same reason why NVidia's Maxwell's are flying off the shelves in face of cheaper but falling-in-sales AMD dGPU's - faster "out of the box", the architecture is newer (native USB 3.0, PCI-E 3.0, etc), significantly better perf-per-watt, lower running costs, not everyone wants to OC, TDP limited smaller form factors, etc. Likewise, not everyone's "budget" happens to be rigidly attached to the exact dollar price of whatever cheapest AMD CPU + mboard bundle happens to be on special offer at the time...
"A $110 AMD is as fast as a $220 Intel". Sure - and
a 3.2GHz G3258 can beat an OC'd FX at 4.8Ghz.
And that's ultimately what the Intel premium is about (and what AMD's lack) - consistency when averaged over thousands of games.