I won't be selling my GTX 1080 as I have 3 PC systems in the house, so the 1080 will be going into one the other systems to upgrade the 780ti in itI did that upgrade on black friday.
I sold my 1080 on ebay for £290 and paid £470 for a 2070 super with COD which I sold for £30. Net spend = £150 to go from a 1080 with zero warranty to a 2070 super which not only is faster, it runs cooler and more efficient and has a brand new warranty on top. I thought that was worth paying £150 for.
My 2070 super is idling right now after gaming at 31C whilst gaming i've never seen it go above 65C usually hovers around 55C to 60C. Beast of a card and I can't believe how cool it runs. Clocks well too.
Plus I wanted something faster them a 2070s as I sometimes game at 4k on my OLED