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PWM fan

Discussion in 'General Hardware' started by nora.e, May 21, 2008.

  1. nora.e New Member

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    trying to figure out what the deal is with them. how are they different from a "normal" fans and why 4 wires?
     
  2. hat

    hat Maximum Overclocker

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    the 4th wire is a sensor that tells how fast the fan is to spin based on temps... that what PWM is
     
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  3. dark2099

    dark2099

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    I believe they allow for the motherboard to control the fan speed, increasing it as the temps get high, its for better power usage and noise control. A standard 3 wire fan only operates at one speed unless controlled by some sort of controller.

    Edit: beaten by hat
     
  4. JC316

    JC316 Knows what makes you tick

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    It can be disabled in the BIOS, but it's exactly what they said it is.
     
  5. hat

    hat Maximum Overclocker

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    Just reposting this cause it says this thread has 0 replies... sorry if this is a duplicate post

    wow something is messed up I couldn't see those two replies below mine...
     
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  6. smig New Member

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    I have funs with 3 wires only and it's possible to control the speed. :confused:
     
  7. jbunch07

    jbunch07 New Member

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    i cant ever trust the sensors on pwm mode if i can i try to manually control the fan speed.
     
  8. DrPepper

    DrPepper The Doctor is in the house

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    Yes with a fan controller it controls the voltage supplied to the fan and less voltage means the fan spins slower and vice versa me thinks :) my asus one just broke :laugh:
     
  9. hat

    hat Maximum Overclocker

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    I run my PWM fan full blast anyway. I didn't buy it for PWM... it just happened to have it.
     
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