I have a 3090 FE when idle I hit 40c and when gaming I hit about 66c.
I just added two USB monitors and when I turn them on at idle I hit 415c on Cam while on my own system monitor soft wear I hit 41c. the cooling fan on the GPU does not turn on which indicates that GPU is within correct temperature , when gaming it shoots up to 476c. on cam software
I think it's a glitch in your software
So I have 1 main monitor and two USB monitors when ever I plug the two USB monitors on the GPU cam temperature reading will display incorrectly i,e 476c when it should be reading 66c.
When I unlpug the two USB monitors the readings return to normal. seems that the Cam software is getting confused .