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Vega overclocks in a very different way to the "norm". I could write a short novel on the subject but (very) simply put there's a watt-based power budget, and running at higher clocks draws more amps. If you lower the voltage you allow a greater amperage to be drawn while staying under the watt limit, so the card clocks itself up. Even with the higher clock you (usually) end up running cooler than stock anyway.
The lower wattage & heat both help avoid throttling of any kind so you get more stable frametimes to boot.
If you tell it to stay at stock clocks then it runs a lot cooler...like GTX cool 😁
That's all subject to the silicon lottery though. Your mileage may vary.
In my mind AMD = Android and GTX = iOS.
The Vega might outperform the GTX but it takes fiddling, tweaking and a bit of luck.
The GTX is just plug & play, cool & calm.
Hence why I am trying to decide, whilst I do not OC now, I have always wanted to dip my toes and have some fun, if it can be healthy for the card and benefit performance and temps I would like to try it. Something feels like you get more value out of the 56 in this regard than what a 1070 would give you, since 56's seem to outperform 1070's quite substantially now in an array of titles.
In that regards I am inclined to go for the 56 if I am getting cooler temps, better performance and the same life span(with luck on the silicon lottery) the 1070 performs well and is out of the box luxury with Shadowplay, low power draw and just working, but will it be as much fun trying to OC(since the 56 seems to be abe to outpace even the 1070ti's in quite a few titles.