Neither of them are as terrible as some reviewers are making them out to be, you just need to spend a bit of time undervolting them. For example, I ran my 1080 @ 2050MHz w/ 1.093v and was always running into a power limiter around 240W. I've since brought it down to 2000MHz w/ 1.000v and in benches (Heaven, Firestrike, Gears 4) I have a peak of 202W while averaging ~185W. Games end up more like 150W-170W even when I push things as hard as I can to still maintain 60FPS minimums. From the preliminary Vega tests @ Gamers Nexus, it looks like it is following in Polaris' footsteps as far as undervolting goes. My next step is to test my 2000MHz/5550Mem clocks down in the 0.9xx volts but I haven't had the time yet. For reference, at stock my card boosts up to 1835MHz w/ 1.042 and consumes 5W-10W more than my OC'd profile. I like having higher clocks, lower voltage, lower temps, lower fan speeds and lower temperatures versus stock. Obviously I'm not getting a Vega since I have a 1080, but if the AIB Vega 56 cards can clock well and undervolt nicely I will surely recommend one to my friend with a 380X who just got an HTC Vive. I hope for good times ahead, hopefully the competition will benefit us consumers and gamers.