Stopping fan oscillation on Cooler Master ML360 SUB-ZERO
While planning a massive city grid, my semi-conductor cooler started making this faint but maddening low-frequency hum. It happened whenever the CPU temp hovered between 35℃ and 55℃, causing the fans to bounce between two speed tiers and creating physical resonance. The default stepped curve was just too crude. I tried locking the fans at 1500 RPM, but that felt wasteful and the wind noise was still audible in a quiet room at night. I switched to a smooth curve method, splitting the temperature range into 5℃ gradients and adding a 5-second response delay to stop the instant RPM jumping. Using a decibel meter, the ambient noise dropped from 38 dB to a whisper-quiet 30-32 dB. The difference in feel is huge. I actually accidentally inverted the curve during setup, which almost let the CPU hit 85℃ before I caught it. Temps now sit comfortably at 58-65℃. Verified everything with noise and temp logs.
