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for the look of it, your gpu is broken and for those temps something fried it runs to high
i run a rx580 modded version (not water cooler) and my temp are 20ºc on idle and 41ºc on full power, my fans dont even spin, they work at 60ºc.
edit: my model is MSI RX580 Gaming X+
Artifacts appear as in the idle and when heated.
Yesterday I left the PC for 10 minutes, put the PC out of the standby mode and saw artifacts in the form of white noise as on old TVs. Reboot, everything is fine
P.S. RX480 have a stronger heat than RX580