I have the superclocked version of EVGAs GTX 1080 8GB for sale. It is in perfect working order and comes in the original box. EVGA shipped me the backplate mod kit right after I bought it so there have been no overheating issues. Price is firm @ $260 + shipping to the conus.
Afternoon, I've had it since it was new, 2016 or 17 I think. I used it on my HTPC until I replaced it with a 5700xt recently and the mod kit was because EVGA screwed up the design and some of the modules weren't being cooled properly. They sent out a kit with thermal pads so there would be contact with the backplate for cooling is all.