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"PWM stands for pulse width modulation. PWM fans and/or pumps are found in some CPU coolers and  GPU  (aka graphics card) coolers. They use an integrated circuit to control the speed of a fan or pump and, therefore, how much cooling it’s providing to the CPU  or GPU. PWM fans and pumps can alter their speed and airflow based on the component's temperature. To use this feature, you’ll need a motherboard with a PWM header and the appropriate software (for help shopping, see our motherboard…"
<https://www.tomshardware.com/uk/reviews/glossary-pwm-pulse-width-modulation-definition,5888.html>