GPU idling at full load all of a sudden

I can't figure out why, but my GPU fan started going nuts, so I checked the temps, and it is running at 78c and is under full load. The hell? I am just in windows with my browser on, and nothing else. Why would it be using so much power?

Browser rendering can use the gpu. Try killing the browser process to and check if anything changes

Yeah, I did. It cooled down a bit, but still above 70.