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Thread: PWM header




  1. #1
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    Default PWM header

    Hi there. I have an GA-EP43-DS3 and the system fan 2 PWM header will not start my PWM fan. The CPU header however will start the same fan.
    Any ideas?

    Thanks
    E6700 @ 2.66GHz | Zalman CNPS9500A | Gigabyte GA-EP43-DS3 | KingstonHyperX 4GB 1066MHz | Asus GeForce 6500GT | Akasa Ultra Quiet 500W | CollerMaster CM630 |
    Vista Ultimate x86 & Windows 7 x86

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: PWM header

    That connection SysFan_2 is controlled via a on-board PWM controller, so it may not be best to use a PWM Fan on this controller. Could be why it will not function

  3. #3
    profJim's Avatar
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    Default Re: PWM header

    The SysFan_2 on my mobo only powers my fans to 45% - 55% of the fan's rated full speed.
    Fans that don't under-volt well (i.e. less than about 9 - 10 volts) won't spin up.
    This appears to be a common design feature on GB mobos. Why? I don't know.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
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  4. #4
    profJim's Avatar
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    Default Re: PWM header

    That connection SysFan_2 is controlled via a on-board PWM controller
    Makes sense, but I have PWM disabled in my bios.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  5. #5
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    Default Re: PWM header

    The PWM works off the CPU header so I don't think its disabled. Or whether I have that option in my BIOS, I've tried ctrl+F1 but get no additional options.

    Lsdmeasap - is there anyway to modify the operation of the onboard controller?
    E6700 @ 2.66GHz | Zalman CNPS9500A | Gigabyte GA-EP43-DS3 | KingstonHyperX 4GB 1066MHz | Asus GeForce 6500GT | Akasa Ultra Quiet 500W | CollerMaster CM630 |
    Vista Ultimate x86 & Windows 7 x86

  6. #6

    Default Re: PWM header

    I thought The only Mobo header with PWM was the cpu fan header and the connecting fan had to have the extra wire (i think its blue) since the stock i7 cpu cooler has this , but my noctua cooler does not. So the Scythes i have on my cpu cooler are always running full speed.

    It might be nice if i could quite those down from time to time.
    i7 930 @ 4.2 ghz (200x21) 1.34 vcore 1.33 qpi
    Noctua U12P se1366 Push Pull w/scythe slipstreams
    6GBOCZ1333 @ 1600 - 9 9 9 24 1.64v
    Gigabyte EX58-UD3R f11
    Corsair tx750 PSU
    EVGA GTX260 SC
    Intel SSD80GBG2C1 OS/Apps
    WD Caviar Black 500gb Data
    ASUS Xonar DX
    Klipsch Promedia 2.1
    CM690 Case 3 in 3 out
    Windows 7 64bit

  7. #7
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    Default Re: PWM header

    Quote Originally Posted by nav_kundra View Post
    Hi there. I have an GA-EP43-DS3 and the system fan 2 PWM header will not start my PWM fan. The CPU header however will start the same fan.
    Any ideas?

    Thanks
    Sys_Fan2 Max is 5v. Fans requiring more volts/amps will not operate.

    Quote Originally Posted by nav_kundra View Post
    The PWM works off the CPU header so I don't think its disabled. Or whether I have that option in my BIOS, I've tried ctrl+F1 but get no additional options.
    There are no control options for Sys_Fan2 in Bios.

    Quote Originally Posted by dbee View Post
    I thought The only Mobo header with PWM was the cpu fan header and the connecting fan had to have the extra wire (i think its blue) since the stock i7 cpu cooler has this , but my noctua cooler does not. So the Scythes i have on my cpu cooler are always running full speed.

    It might be nice if i could quite those down from time to time.
    A three pin fan can be used on the CPU PWM header. You must choose the voltage setting in bios under cpu fan control in order to control fan speed correctly. If you leave it set for Auto you fans will spin 100%.
    Last edited by gymenii; 09-04-2009 at 07:12 AM.
    E8600
    GA X48-DS4
    4GB OCZ Platinum LV-1150

    2x Samsung F3 500GB RAID0
    PCS+ AX5870
    LG W2600H-PF
    Lian Li A16B
    Win7 Pro x64

  8. #8

    Default Re: PWM header

    Sweet , thanks Gymenii. Does this voltage setting apply to all the mobo fans such as the pwr fan and the rest of the cpu fan headers? I would assume it does... I have not seen this option in the bios, maybe i haven't looked close enough. We will find out soon enough tonite.
    i7 930 @ 4.2 ghz (200x21) 1.34 vcore 1.33 qpi
    Noctua U12P se1366 Push Pull w/scythe slipstreams
    6GBOCZ1333 @ 1600 - 9 9 9 24 1.64v
    Gigabyte EX58-UD3R f11
    Corsair tx750 PSU
    EVGA GTX260 SC
    Intel SSD80GBG2C1 OS/Apps
    WD Caviar Black 500gb Data
    ASUS Xonar DX
    Klipsch Promedia 2.1
    CM690 Case 3 in 3 out
    Windows 7 64bit

  9. #9
    Join Date
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    Default Re: PWM header

    Quote Originally Posted by dbee View Post
    Sweet , thanks Gymenii. Does this voltage setting apply to all the mobo fans such as the pwr fan and the rest of the cpu fan headers? I would assume it does...
    No, just CPU.


    Quote Originally Posted by dbee View Post
    I have not seen this option in the bios, maybe i haven't looked close enough. We will find out soon enough tonite.
    I don't have your MB, so not sure exactly where it is, but most newer GB MB's have this option.

    Edit: In BIOS, it's located in PC Health Status

    Edit2: From X58-xxx manual;
    CPU Smart FAN Mode: Specifies how to control CPU fan speed. This item is configurable only if CPU Smart FAN Control is set to Enabled.

    Auto - Lets BIOS autodetect the type of CPU fan installed and sets the optimal CPU fan control mode. (Default)

    Voltage - Sets Voltage mode for a 3-pin CPU fan.

    PWM - Sets PWM mode for a 4-pin CPU fan.

    Note: The Voltage mode can be set for a 3-pin CPU fan or a 4-pin CPU fan. However, for a 4-pin
    CPU fan that is not designed following Intel PWM fan specifications, selecting PWM mode may not
    effectively reduce the fan speed.
    Good Luck
    Last edited by gymenii; 09-05-2009 at 03:20 AM.
    E8600
    GA X48-DS4
    4GB OCZ Platinum LV-1150

    2x Samsung F3 500GB RAID0
    PCS+ AX5870
    LG W2600H-PF
    Lian Li A16B
    Win7 Pro x64

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