Reckoner223
I am not overclocking my CPU and my Seasonic focus gold 750 psu is shutting down on a basic power test with the FTW ULTRA 3080.
I had that problem with my 2080 Ti FTW3 Ultra...switched to a 1000 watt power supply and that solved the problem. Quality power supplies do sometimes go bad, but IMHO you need some good margin in the power rating, even if the supply if normally working ok. The two Seasonic 750 watt supplies that both gave me this problem are working fine in my non-gaming pc's.