Don't look at the 1080 or 1080ti for ETH - they get less hashrate than the 1070 and same ballpark as the 1060, due to the much higher latency on GDDRX 5 ram vs GDDR 5.

 IMO don't look at any NVidia for ETH right now anyway, they do better on other options.



 The GPU world at the high end has been Nvidia and AMD for a very long time now, as nobody else has been willing to put the MASSIVE amount of development into trying to break into the high-end market any more.
 Even Intel has never gotten into the high end of the market, and they appear to have given up on even trying at least a decade back (they can't even compete with AMD on the GPU side of an APU, my 3 generation old A10-5700 has better GPU performance than ANYTHING Intel except a very few VERY VERY EXPEN$IVE "workstation" CPUs with the Iris Pro 6200 graphics on chip - and it can match THOSE).

 There's a reason both Microsoft and Sony went to AMD for the APU in their most recent consoles (both the XBox One line and the Playstation 4 line use AMD APUs that aren't a lot different than the current AMD A10-7860K - a few more CPU cores at a lot lower clock but somewhat LOWER GPU performance).


 I suspect that the current issue with AMD availability on the RX series is that Global Foundries has maxed out their capacity and can't keep up with the demand - which would explain the recent AMD/GF "revision" to their chip supply agreement where AMD specifically got the right to use OTHER FOUNDRIES (abet at a cost) - coupled with AMD trying to stockpile VEGA cards ahead of them being released for sale.
 Also keep in mind Ryzen sales will affect usage of the capacity of GF.


 Mining GPU sales are only a fraction of what gamers buy - though sometimes on large mining card surges it might POSSIBLY hit as high as 20% of total sales of a "popular with mining" card, which can easily clear out a channel when the surge hits suddenly and there isn't enough stockpile in the channel to handle it.