Why is my GPU throttling in S.T.A.L.K.E.R. 2?

Parkouring in Chernobyl, my GPU hit 82-85℃, triggering throttling. Maxing fans was too loud. I used GamePP Fan Curve Configuration Panel to raise the 70℃ threshold from 40% to 65%. After a second adjustment adding 5% speed, AIDA64 confirmed temps stabilized at 68-72℃. HWiNFO verified the initial spike was gone. The cooling is now silent and effective.