In high-fidelity scenes in Hellblade 2, my Noctua NH-D15 G2 fans ramp up and down constantly. How do I stop this noise?

It's honestly ridiculous—I bought the top-tier Noctua and the fan noise still manages to break the immersion during peak loads. While the NH-D15 G2 is a beast, the extreme lighting calculations in Hellblade 2 caused my CPU temps to bounce between 70-85℃, making the fans hunt frantically between 800 and 1500 RPM. It was a distracting mess. I tried locking the RPM in software, but the temps shot up to 92℃ and I started seeing frames drop—a total waste of time that just made me angry. I eventually went into the BIOS, switched the fan control from PWM to DC, and manually drew a flat voltage curve to lock the RPM between 1100-1300. HWiNFO showed temps stabilized at 78-82℃ with zero audible changes in pitch. I did have an issue where the fans wouldn't stop at idle in DC mode, but adjusting the start-up voltage threshold fixed it. Now it stays at 75-80℃. Stability tests are done and the config is backed up.