Control 2 is tanking from 60 to 20 FPS during particle-heavy scenes on my H310M; why?

Whenever the screen filled up with floating debris, my frame rate would dive from 60 FPS to 20 FPS—it was absolutely pathetic. The Galax H310M Warrior D4 has zero heatsinks on the VRMs, so under load, they'd hit 105℃ instantly, forcing the CPU to downclock from 3.8 GHz to a miserable 1.2 GHz. A total hardware nightmare. I tried the 'Enhanced Cooling' mode in BIOS, but since there's no metal to dissipate heat, the fans just screamed while the temps stayed high. I eventually bought a cheap 8cm fan and pointed it directly at the VRMs, then capped the PL1 power limit at 45W in the BIOS. In CPU-Z, the VRM temps dropped from 108℃ to 82-86℃, and the clock stayed within 0.2 GHz of the target. I lost about 8% single-core performance, but the game is actually playable now because the massive drops are gone. CPU temps are 70-76℃. Saved this 'survival' config to a backup.