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07-08-09
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#1 (permalink) | ||||||||||||
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Overclocker in Training
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PWM / DC Mode
Whats the difference between those 2 modes for CPU fan in BIOS? Default is PWM, but i have no idea what it means.
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07-08-09
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#2 (permalink) | |||||||||||||
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2 + 2 = 5
 
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If you fan has a 4-pin plug, it is a Pulse Width Modulation (PWM) fan.
If it has a 3-pin plug, is a standard fan with RPM monitoring. PWM control fan speed by providing pulses of +12v to the fan. The slower the pulses, the slower the fan spins. Standard fans are controlled by adjusting voltage. It lower the voltage from +12v so the lower the voltage, the slower the fan spins .
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