PWM control is also used in your VRM and throughout your motherboard in many different places. If you feed a fan 12v constant and use a 50% duty cycle PWM rate, then you would theoretically get 6V. That would result in a 50% duty cycle since you are pulsing (turning on) half the time. So let's say in a 10-second cycle we pulse five times to 100% for one second each time. These pulses result in a duty cycle, which can be used to calculate final voltage. PWM Mode (4-pin fans): Stands for pulse width modulation, and it basically means you get pulses (basically going to an ON position) at a periodic rate, and in this case, it's thousands of times a second.
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