No I only buy 80 8GB model I think it is easy to sell it after.
And yes for the heat the summer is comming it go to 75°c at ~30°c ambient.
You can buy some card ROI it in like 2-3mounts Make some more mounts profit and resell the card if you whant.
And the card will always be waranty.
Then you can buy some vega or 1080Ti or juste stay with your card.