How to fix core frequency oscillation in Avowed Path Tracing mode?

I found it ridiculous that a 50-series card only hit 30 FPS in Path Tracing with constant screen twitching. I tried 'Prefer Maximum Performance' in the drivers, but the GPU hit 85℃ per GPU-Z and sounded like a jet engine without fixing the stutter. I used the GamePP DLSS/FSR Image Sampling Calibrator to set sharpening to 65 and resolution to 95%. RTSS then showed frame times suppressed to 15-19ms, and SpeedFan recorded fans at 1600-1800RPM. Now I can finally export