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Thread: EP35C-DS3R Fan headers and sensors




  1. #21
    Join Date
    Oct 2010
    Location
    Greece
    Posts
    109

    Default Re: EP35C-DS3R Fan headers and sensors

    I did my small research about the power headers , and my discoveries are not much,
    due the complex layout of the PCB , but still are important.

    It looks that three of the four Fan Headers, they use as source the MOSFET 3310GH
    that is an very powerful chip , extremely powerful to power not just fan , but the 1/4 of the motherboard it self .

    That's why when I did use an power hungry fan 480mA on the CPU header,
    the motherboard did not get damaged.

    Usually , older motherboard designs, they had individual smaller MOSFET for its fan header , that was offering the 1/10 of the power that the MOSFET 3310GH can give . http://www.elektrofor.ru/pdf/tranzistory/AP3310GH.pdf

    I did verify my story about the MOSFET 3310GH , finding an German message ,
    that some one with P35-DS3R , managed some how to burn the MOSFET 3310GH,
    and all the fans on the motherboard stopped working ...

    The only Fan header that looks unclear from where it gets powered ,
    are the SYS-Fan1 ( behind the NB Bridge ) .
    This one could possibly get power from some line , that comes from the NB it self.
    I speculate here , because I would had to remove the heat-sink so to find out,
    and I did not liked to remove it just for that.


    SYS FAN2 (PWM)

    Well by having the Nanoxia PWM to DC controller , I had the chance to test this Fan header for good .

    And by plugging the 4 pin connector at the default pin out , and also by rewiring the Nanoxia PWM-X connector, so to actually become an perfect match for the named Pins by the Gigabyte schematic on the manual.

    And I like to verify , that the users manual schematic are totally wrong .

    Both PWM headers like CPU-FAN and SYS FAN2 , are using the same pins out,
    but the SYS FAN2 , limits the output to 5V, for 3PIN fans & PWM fans .

    And actually , the PWM fan it will spin slower than the 3PIN fan, because the inner controller of the PWM fan , it will drop the actual motor voltage by 1 - 1,5V minimum , due the inner resistance of the circuitry.

    Picture ..



    EP35C-DS3R Fan headers and sensors-power-plugs-jpg
    Last edited by Kiriakos; 12-07-2010 at 06:40 AM.
    EP35C-DS3R F4 | Q6600 | ProlimaTech Armageddon
    HYPER-X KHX1600C8D3T1K2 /4GX
    PC3-12800 1600MHz (1066 CL 6-6-6-21)
    ATI HD 5770 Vapor - X| X-Fi music |RAID-1 WD Raptors
    HIPER HPU-4M780-PE

    XP PRO 32bit

  2. #22
    Join Date
    Oct 2010
    Location
    Greece
    Posts
    109

    Default Re: EP35C-DS3R Fan headers and sensors

    And so the easy choice for the SYS FAN2 ,are to used only to drive one small NB fan .

    But its possible if you get 12V from an molex plug, and drive that voltage at the PWM fan or PWM to DC controller 12V cable ( directly ) with the rest pins connected normally at the header , to get back the full power , that the 5V takes away.

    Last picture.

    EP35C-DS3R Fan headers and sensors-nb-fan-jpg
    EP35C-DS3R F4 | Q6600 | ProlimaTech Armageddon
    HYPER-X KHX1600C8D3T1K2 /4GX
    PC3-12800 1600MHz (1066 CL 6-6-6-21)
    ATI HD 5770 Vapor - X| X-Fi music |RAID-1 WD Raptors
    HIPER HPU-4M780-PE

    XP PRO 32bit

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