Let's get back on topic .... will Vega be performant enough for the enthusiast market when it launches in 1H 2017 since
Volta may appear on 16nm FinFET about the same time for the Power9 servers? What performance level should AMD be targeting with Vega ... 1080, Titan XP, or Volta?
Well if we compare with latest release of Nvidia Tesla and the deep learning combo, Nvidia have present Pascal P100 in April, with some "specific order" for specific contract for some supercomputers, in June 2016 they had announces the Tesla P100 with availability in Q4 2016 ( so still not available ), and so far the Titan "XP" based on GP102 who have been launched some weeks ago. ( only available through Nvidia shop anyway for the moment) . ( In between ofc, they have launch GP104, GP102 etc )
So far we have an availability for GP100 Tesla based Q2016- 2017, and we know that Nvidia dont like to sold gpu for 3-6months only, knowing only Power 9 server of IBM will include Nvlink 2.0, and knowing how Nvidia like to present the gpu with availabilitty 8 months to year then, .... Can we really think that Volta Tesla and Quadro, will be available in 2017, or before Q4 2017 ? Outside some specific contract with Server using IBM Power9 ?
So just for said, that the IBM Power9 series availbility dont mean forcibly that you will see Geforce based product, quadro and Tesla, released the day after.
As for the gaming part, a replacement to 1080, 1070 and maybe a titan, ( but at this date, GP102 dont exist outside Titan ?) i think AMD know that Nvidia refresh his lineup every year. But when they will be released is a bit unkown.