Why does my Hyper 612 APEX overheat and cause frequency swings in dense jungle scenes?

While sneaking through the brush, my CPU cores were swinging wildly between 88-94℃, causing my FPS to tank from 90 down to a stuttery 42. The default fan curve on the Cooler Master Hyper 612 APEX is way too sluggish before 75℃, letting heat soak into the core far too quickly, which honestly left me scratching my head. I first tried enabling the High Performance power plan in Windows, but that was a total bust; it didn't stabilize the clocks and actually bumped my idle temps up by 8℃. I eventually dove into the BIOS, switched fan control to Manual, and cranked the slope for the 70-85℃ range by 15% per degree. Monitoring via HWInfo showed peak temps finally suppressed to 78-83℃, with frequency fluctuations narrowing to under 0.2GHz. I did make a mistake early on by pinning the fans to 100%, which created a low-frequency resonance that actually made my chassis shake—pretty annoying until I capped them at 1800 RPM. Now the VRM area stays steady at 62-67℃. I've verified the thermal throttling is gone, and the new curve is saved. It's a bit louder, but at least it's playable.