Ok, just a little update. Running all stock, and just monitoring through wattman, 1618 has been the highest reported core clock, 945 mem, 76C . If it is throttling, I could not tell (or care), every single game I have (376 on steam) plays just fine for me, anything I've streamed looks fantastic, noise has NEVER been an issue, even when I have no headphones on. Just laying down my facts that I have seen. Love this card, hope Navi is great as I will get one and my older son really,really wants this card.
Note i do not have all 376 games downloaded, just a good selection, Dirt rally, dirt 4, grid 2, GTA V, tomb raider, skyrim, hitman, sleeping dogs, etc. I did (after a caffeine buzz) put my system back in my cooler master evo case, thinking all the mesh may make a temp difference, everything semms to record close to the same temps as my R5 case. Just now people can see my Vega through the top!