Keep pressing the ESC key until the BIOS appears.
Find the smart fan mode by the following steps and set values of what you expect to
Menu: Advanced——>Hardware Monitor——>Smart fan mode
P.s.
PWM (Pulse Width Modulation) is a commonly used method of motor speed control. In fan startup, the PWM setting value determines the fan startup speed. For example,PWM values of 60 and 120 respectively represent different start-up speeds.
You can change the fan speed by adjusting Fan start PWM