Why does my Jonsbo CR-1400E ARGB keep causing clock speed fluctuations during UE5 real-time renders?

While running the Lumen global illumination demo, my CPU cores spiked to 92-96℃ within two minutes, causing the clock speed to tank from 5.0GHz down to 3.2GHz. The Jonsbo CR-1400E ARGB just doesn't have enough fin surface area to handle this kind of compute density, creating a massive thermal bottleneck. I initially tried enabling power-saving mode in the BIOS, but that was a disaster—my frame rates plummeted from 45 FPS to 22 FPS, which left me totally baffled. I ended up redefining the fan curve, forcing 100% full load once the temp hits 65℃, and switched my case front fans to a positive pressure setup. Using HWiNFO, I saw the peak temps get clamped between 78-84℃, with clock fluctuations narrowing to a stable 4.6-4.9GHz. I did notice some annoying resonance noise around 1500 RPM when I first tweaked the curve, but that vanished after I tightened the cooler base. CPU power draw is now steady at 115-130W, and heat dissipation is way more efficient. The performance panel confirms the clocks are locked, and temps are holding steady at 78-84℃.