Sorry but why are so desperately trying to warp this into some us vs them war in an AMD thread??
I had a GTX660 and GTX960 - try harder next time and stop twisting things out of desperation without thinking.
The R9 270X and R9 270 are more efficient than the sub £200 R9 285,R9 380,R9 380,R9 380X.
So using your warped way of thinking AMD should have compared this to the R9 380 and R9 380X with worse performance per watt or the rebadged R9 370 which is the only 70 series part AMD sells in the 300 series part.
So basically you are saying AMD should have compared it to worse performance/watt parts.
Ah,OK so you could show your false concern and then complain AMD was using the least efficient parts on purpose to overstate the improvements.
Edit!!
Next time think about what you post:
http://i.imgur.com/Sbm67wu.gif
AMD could easily have used the R9 285,R9 380,HD7790,R7 260X and any other card apart from the R9 270X.
The GCN cards since Pitcairn and Cape Verde had a decline in performance/watt in desktop SKUs until Fury was launched and that is nowhere near the price of the sub £200 SKUs like the RX470 and the performance either.