How to fix random stutters caused by the B240 AIO pump?
Right in the middle of a stealthy conversation, the screen would just freeze for 0.3 seconds. It was subtle but frequent enough to ruin the whole rhythm of the game. I used some monitoring tools and noticed the Cooler Master B240 pump speed was swinging by 200-400 RPM during load changes, causing 10℃ temp spikes in half a second, which triggered a quick clock throttle. I tried lowering the shadow quality in-game, which gained me maybe 5 FPS but didn't stop the stutters—I knew I had to fix this at the hardware level. I went into the BIOS, changed the pump mode from 'Auto' to 'Full Speed', and lowered the radiator fan trigger to 50℃. Core temps now stay between 70-76℃ without those spikes. I did notice a slight high-pitched whine from the pump running at max, but I adjusted the fan curve to mask the noise. GPU temps are stable at 62-68℃ and fans are locked at 1200-1400RPM. No more frequency dips.
