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  1. #11
    ROG Guru: Yellow Belt Array Classic_GOD's Avatar
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    Quote Originally Posted by Superglu View Post
    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?
    Yes, they will be controlled through voltage. Modern fans have very low current draw, the generated heat should be negligible.

  2. #12
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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.
    This should really to be clearly documented on your products. So much time wasted trying to work out why I wasn't able to control my PWM DDC pump off a chassis fan header (better situated for my pump) on my Impact board.

    J.

  3. #13
    ROG Guru: Green Belt Array Henkenator68NL PC Specs
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    Quote Originally Posted by BigRed View Post
    This should really to be clearly documented on your products. So much time wasted trying to work out why I wasn't able to control my PWM DDC pump off a chassis fan header (better situated for my pump) on my Impact board.

    J.
    Well connecting a pump to a fan header?

    Seriously you should read the manual, it states how much ampere a Fan_header can provide...
    Nowhere near enough to controle a pump, you need a dedicated controller with something ranging from 25 - 40 Watt!!
    Look in your pump specs how much it draws and compare it to this:
    The manual of ROG mobo States under Fan_headers: maximum fan power = 1A
    Watt = volt x ampère.
    So 12Volt x 1 ampere = 12Watt

    No pump can work normally with so little juice. Also it can fry your Fan_header

  4. #14
    ROG Guru: White Belt Array Melkor PC Specs
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    I advise You should read manual - there are pumps with PWM control - power is delivered via molex connector from PSU and PWM signal/current RPM read via 4 PIN connector from motherboard. I use it on my EK DCP 4 PWM on Maximus VI Formula via CPU fan.
    Last edited by Melkor; 02-27-2015 at 12:26 PM.

  5. #15
    ROG Guru: Green Belt Array Henkenator68NL PC Specs
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    Originally Posted by Raja@ASUS

    Chassis fan headers control in DC mode only - and that will control 4 pin fans but not in PWM mode.


    Quote Originally Posted by BigRed View Post
    This should really to be clearly documented on your products. So much time wasted trying to work out why I wasn't able to control my PWM DDC pump off a chassis fan header (better situated for my pump) on my Impact board.

    J.
    Quote Originally Posted by Melkor View Post
    I advise You should read manual - there are pumps with PWM control - power is delivered via molex connector from PSU and PWM signal/current RPM read via 4 PIN connector from motherboard. I use it on my EK DCP 4 PWM on Maximus VI Formula via CPU fan.

    I suggest your learn to read the posts !!

    Raja said: CHASSIS HEADERS DO NOT WORK IN PWM MODE, BIG RED SAID I CONNECTED TO CHASSIS HEADER.

    AND YOU CLAIM PWM WORKS FOR THE ABOVE MENTIONED OP?

    Why that comment, no need . its rude and offensive.

  6. #16
    ROG Guru: White Belt Array Melkor PC Specs
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    Quote Originally Posted by Henkenator68NL View Post
    Well connecting a pump to a fan header?

    Seriously you should read the manual, it states how much ampere a Fan_header can provide...
    Nowhere near enough to controle a pump, you need a dedicated controller with something ranging from 25 - 40 Watt!!
    Look in your pump specs how much it draws and compare it to this:
    The manual of ROG mobo States under Fan_headers: maximum fan power = 1A
    Watt = volt x ampère.
    So 12Volt x 1 ampere = 12Watt

    No pump can work normally with so little juice. Also it can fry your Fan_header
    Your answer on BigRed's post provoked my reaction as I considered Your comment actually as offensive.

    He said it should be documented in specification for example on asus website before people make purchase that chassis 4 pin connectors do not support PWM which fools a lot of people, because they consider 3 pin connectors as DC controlled and if it's 4 pin then it must be PWM while it's not. There is a lot misinformation - hey look here http://www.ocaholic.ch/modules/smart...=4&itemid=1056
    "ASUS decided to use 4-pin PWM headers in all eight cases. Therefore it is possible to adjust rotation speed in the BIOS or in Windows"
    From this review of Maximus VI formula people could wrongly believe that is true while we know it's not like that.

    You can check this http://dlcdnet.asus.com/pub/ASUS/mb/...VI_Formula.pdf under 7. CPU, chassis, and optional fan connectors - cha_fans are shown with same pins as cpu_fan GND/CHA FAN PWR/CHA FAN IN/CHA FAN PWM and there is no word about not supporting PWM function. So yes he is right it should be documented.

    I used wrong words in my post above - I should write:

    I advise You should look for DDC PWM pump specification before posting. DDC PWM pump comes with Molex connector which goes to PSU for power delivery and 4 pin fan connector with actually only 2 pins wired - PIN 3 Sense and PIN 4 Control - there is no GND and 12V wires so talking about burning his fan connector is worthless as well as saying "The manual of ROG mobo States under Fan_headers: maximum fan power = 1A". There is not such information regarding cha_fans - there is only "The CPU_FAN connector supports the CPU fan of maximum 1A (12W). He don't need fan controler for this pump and he can use 4 PIN fan connector coming from the pump with CPU_FAN as unfortunately it's the only one true PWM connector without worrying about burning Fan_header. If it's used on CHA_FAN then simply motherboard will be able to read and show RPMs but pump will run at full speed all time and draw power from MOLEX connector.

    EDIT:
    One funny fact regarding what people see before purchase - posted above http://dlcdnet.asus.com/pub/ASUS/mb/...VI_Formula.pdf from Asus website is shown as Version E8336 of manual - same as my manual which came in "physical" version along with motherboard. Compare these two - in pdf version You see cha_fan pin number 4 as PWM while in manual that came inside motherboard box (with same revision) it's changed to +5V. I love Asus products, most of my PC parts are from Asus, but this trick can't be forgiven.
    Miniatura de Adjuntos Miniatura de Adjuntos DSC_0216.jpg  

    DSC_0217.jpg  

    Last edited by Melkor; 02-27-2015 at 05:14 PM.

  7. #17
    ROG Guru: Green Belt Array Henkenator68NL PC Specs
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    My comment was not intended as offensive, so if that came across that way my bad.

    I did extensive research on fan headers and their function and abilities:

    https://rog.asus.com/forum/showthrea...-it-do-for-you

    There is a lot off information there. On top off that there are/where a lot off people here on the forum that could have answered that kind of questions.

  8. #18
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    Haha, well that all kicked off. I think it's been cleared up.. but I certainly haven't tried to power my PWM DDC pump using a fan header.. I'm no fool. the fan header simply provides the RPM control via the PWM function. My pump is indeed connected correctly via molex. My point stands.. 4-PIN hears are PWM headers as non PWM 4-pin should simply be 3-pin headers.. and so it should be clearly documented. But nevermind, the DDC pump isnt loud at 4000rpm so I'm over it.

    J.

  9. #19
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    Question

    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.
    Apologies for bumping that thread - but I'd like to verify if the above is true for the Z68 based Maximus IV Gene-z as well?

  10. #20
    ROG Guru: Orange Belt Array geneo PC Specs
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    Quote Originally Posted by BigRed View Post
    This should really to be clearly documented on your products. So much time wasted trying to work out why I wasn't able to control my PWM DDC pump off a chassis fan header (better situated for my pump) on my Impact board.

    J.
    It is documented in the MH6 manual, though not clearly - you have to know how to interpret it. Section 1.7.9 number 7. Where the rightmost fan header pin says PWM, it is PWM a controlled header. Where it says 5V, it is voltage controlled header, regardless of how many pins the header has. s. The fan header description is probably the same for other motherboard manuals, so look for this.

    Not documented for the MH6, the CPU fans can be either voltage controlled or PWM controlled. There is a micro switch on the CPU fan header that detects whether you have a 3 pin or 4 pin fan plugged in. If it is 3 pin, it is voltage controlled, if 4 PWM. The CPU OPT fan control - voltage or PWM - follows whatever the CPU fan header detects. Only a select few MB have the micro switch.
    Last edited by geneo; 09-30-2015 at 11:19 PM.

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