I can probably tweak the fan curve, sound isn't a massive issue with headphones. 90% of the time it's completely silent and cools passively, if it's above 50 degrees it's pretty much on full revs but as a result it barely scrapes above 60 degrees even when it's being thrashed. I'd assume the Vega version would be similar. It's still quieter than the Intel stock cooler I had up until a year ago though, it's just super jarring when the computer is usually completely silent.
I like the monitor and doubt I could go back now. I thought it was gimmicky too initially but things like straight lines work fine when you're used to it- I'd suspect a non curved ultrawide would have problems there anyway since there's a decent difference in distance to the eye from centre to edge. It did have some teething problems but it's working fine now.
I dunno, how is that thing going to cope with 3440X1440 at 100fps? Like at all...
That's what freesync is for, essentially. Even a 1080Ti will struggle getting 4k/60 on many games, but if you've got adaptive sync the reduced frame rates have a lot less effect. Vega64 is roughly 1080 level performance so a decent amount faster than a 980Ti- if a 980Ti gives 60fps a Vega ought to give around 80. I also hate some of the more demanding gimmick sfx and would turn them off anyway.
I wouldn't try running TW3 on the 580 at that res though except on medium settings. It copes with Kingdom Come Deliverance, just, and actually does pretty well on Mass Effect Andromeda but TWitcher3 has too many gimpworks features baked in to do well on AMD.