I'm legit buying a new case because I don't think mine will be able to cope with the heat output from the new GPUs.
I know that'll probably be an unpopular opinion but PC components should be subject to the same power saving laws that lamps, air conditioners etc. have faced in the last few decades. People were consuming more power than whole countries to mine bitcoins a while back for God's sake. The idea that a single chip would need 250 - 400 watts to function no longer fits today's zeitgeist.