My Cooler Master B240 pump speed keeps fluctuating during base building in Ark 2, causing overheating. Why does this happen?

While handling incredibly complex biological models, my CPU temps suddenly rocketed from 65°C to 94°C, which made me seriously doubt the smart scheduling of this AIO. The default pump curve on the Cooler Master MasterLiquid B240 is just too sluggish when hitting transient high loads, letting heat build up in the core within a single second. This triggered a brutal clock speed drop from 5.0GHz down to 3.2GHz. I first tried enabling 'Extreme Performance' in the software, but that only shaved off 3°C and introduced a piercing resonance noise from the pump, while the stuttering remained. It was a total waste of time. I eventually dove into the BIOS and forced the pump to 100% full speed, while setting the radiator fans to a non-linear stepped climb between 70°C and 85°C. Monitoring via HWiNFO showed core temps stabilizing in the 68-74°C range, and frame time variance tightened from 15-40ms down to 8-14ms. I actually realized I had mistakenly plugged the fan header into a SYS port instead of the CPU header, which broke the temp linkage; once I swapped the cables, it finally clicked. Liquid temps are now sitting at 34-39°C, and the whole rig feels rock steady. All optimized cooling parameters are saved, and the system is finally behaving.