Why is my screen tearing during mech swarms in Horizon Forbidden West?

Mech swarms in Horizon caused screen tearing because my VRM hit 92°C per GamePP Hardware Sensor, causing voltage spikes. I added case fans, which helped slightly but didn't fix the instability. I used GamePP Hardware Sensor to identify hot phases and tightened voltage tolerance to ±1%. 3DMark confirmed VRM temps stabilized at 72-78°C, eliminating the microsecond voltage fluctuations.