I really, really doubt Big Navi will be that powerful. Now don't get me wrong, I hope they do, but it would be stupidly big improvement gen over gen only from a new architecture because 7nm+ can't be much better than 7mn.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.