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Thread: 3pin, 4pin, PWM, Voltage Control?

  1. #1
    ROG Guru: Yellow Belt Classic_GOD +20 Classic_GOD's Avatar
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    3pin, 4pin, PWM, Voltage Control?

    Hi,

    Firs of all I'm sorry if this was answered before but I can't find the clear answer for my question.

    I'm planing to join the ROG family once the M6Impact becomes available and wanted to make sure what kind of fan speed regulation are the ROG boards capable of using for chassis fan headers. I know for that Asus uses new connector on the CPU Fan header to detect what kind of fan is connected but all the other 4-pin fan headers on the motherboard are just standard fan headers.

    The only way to control both 3pin and 4pin fans (and I know they are capable of controlling both) without any detection is to use voltage regulation or have menu item to set the type of the fan. I didn't saw any 'fan type' setting on the UEFI screenshots for ROG boards and also didn't saw option like this in UEFI of my current ASUS board (P8H77-I).

    So my question is:
    Are the chassis fan headers on new ROG boards capable of controlling fans using PWM (and if so how you set them in PWM mode) or are they always voltage controlled.

    The answer to this question will influence my choice of fans for my next build so I hope someone will be able to answer it
    Thanks.

  2. #2
    Old Geezer Menthol +100 Menthol +100 Menthol's Avatar
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    I believe all fan headers are 4 pin PWN, you can set in bios several options on speed control for all headers, or speedfan with software, I believe it may only be the CPU fan header that can control a 3 pin fan properly

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    Not to be taken seriously Raja@ASUS has disabled reputation Raja@ASUS's Avatar
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    Chassis fan headers control in DC mode only - and that will control 4 pin fans but not in PWM mode.
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    Old Geezer Menthol +100 Menthol +100 Menthol's Avatar
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    Thanks for clarification Raja

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    ROG Guru: Yellow Belt Classic_GOD +20 Classic_GOD's Avatar
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    Quote Originally Posted by Raja@ASUS View Post
    Chassis fan headers control in DC mode only - and that will control 4 pin fans but not in PWM mode.
    That was the answer I was looking for. Thanks!

    [EDIT]
    I know it's off-topic but if I can ask just one more related question
    Do the new ROG boards use real CPU core temps for fan control or like my P8H77-I cpu socket based temp sensor?
    Last edited by Classic_GOD; 06-19-2013 at 01:47 PM.

  6. #6
    ROG Member Kwami +10
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    Quote Originally Posted by Classic_GOD View Post
    That was the answer I was looking for. Thanks!

    [EDIT]
    I know it's off-topic but if I can ask just one more related question
    Do the new ROG boards use real CPU core temps for fan control or like my P8H77-I cpu socket based temp sensor?
    They use a combination of the on-die sensor and a socket-based sensor to produce a value that never matches other temperature readings.

  7. #7
    ROG Guru: Yellow Belt Classic_GOD +20 Classic_GOD's Avatar
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    Quote Originally Posted by Kwami View Post
    They use a combination of the on-die sensor and a socket-based sensor to produce a value that never matches other temperature readings.
    Well, that's a little disappointing. Thanks for the answer

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    ROG Guru: Green Belt Henkenator68NL +100 Henkenator68NL +100 Henkenator68NL's Avatar
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    Quote Originally Posted by Classic_GOD View Post
    Well, that's a little disappointing. Thanks for the answer
    Just use either Realtemp or Coretemp, they are pretty reliable.However in combination with fanspeed control, the temps from the mobo are used. And that gives sufficient cooling control.

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    ROG Guru: Yellow Belt Classic_GOD +20 Classic_GOD's Avatar
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    Quote Originally Posted by Henkenator68NL View Post
    Just use either Realtemp or Coretemp, they are pretty reliable.However in combination with fanspeed control, the temps from the mobo are used. And that gives sufficient cooling control.
    This is what I do right now. I create a log of real core temps and temps indicated by FanExpert and based on that I determine how to set my fans.

  10. #10
    ROG Member Superglu +10
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    Quote Originally Posted by Raja@ASUS View Post
    Chassis fan headers control in DC mode only - and that will control 4 pin fans but not in PWM mode.
    Does that mean 3-pin fans will be controlled through voltage? I read that doing so generates heat in the controller, how will the motherboard dissipate this heat?

    I just ordered a Gene after a long indecisive struggle between the Gene and the ASRock Z87M OC Formula. Hope I made the right decision!

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