Fixing Valkyrie V360 MIST pump noise in Horizon Forbidden West
The Ultra graphics in this game are breathtaking, but the high-frequency whine from the pump sounded like a mosquito in my ear, totally ruining the immersion. The Valkyrie V360 MIST pump at 100% full speed hits a resonance frequency right in the 2-4kHz range, which is incredibly piercing in a quiet room. I tried lowering the fan speeds to mask it, but that just let the CPU hit 85-89℃, which was a disaster. I went into the BIOS and flipped the pump control from DC to PWM, locking the speed at a 75% sweet spot, and moved the radiator from the top to the front to help with air bubbles. Using a decibel meter, the noise dropped from 42dB to 31dB, and CPU temps only rose by 2℃, staying around 68-74℃. After switching to PWM, the pump actually stopped for a second until I raised the minimum voltage threshold from 5V to 7V. Now water temps are a steady 38-42℃ with fans at 1200 RPM. The noise curve is finally smooth.
