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Thread: Wiring 2 fans to one header




  1. #81
    boondocks's Avatar
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    Default Re: Wiring 2 fans to one header

    Quote Originally Posted by wazza300 View Post


    Come on Gigabyte!!!!
    Are you bemoaning the fact Gigabyte doesn't put two cpu fan headers on the boards? That would be nice to have 2 that would work in sync with each other.
    According to Sin the "smart" fan headers on the new boards (maybe older ones too?) may not deliver a full 12v and implied he runs his liquid pump off the psu. (something I'm going to try today-except the only way to monitor is to do real testing which will be confounded because the ambient temps are cool today)
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  2. #82
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    Default Re: Wiring 2 fans to one header

    yeah i was just saying it would be good if gigabyte added two cpu fan headers to their boards

    if i were you id pick up a cheap fan controller,i found that way to be the best,heres one i used worked fine and cheap

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  3. #83
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    Default Re: Wiring 2 fans to one header

    Some fan controllers have a very limited voltage adjustment range and might not lower fan speeds sufficiently.
    Many fan's don't under volt well and will stop spinning when the voltage is set too low.
    Higher quality fans and controllers will list their voltage ranges.
    If you can't find the specs, trial and error is the only way to find out how low you can go.
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  4. #84
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    Default Re: Wiring 2 fans to one header

    I think I'm going to slip one in whenever I make the order for the 3770k. Ace & wazza gave me a recommendations, I'll look at anything people have used and recommend.

    I'm a little paranoid now about running 2 fans on the cpu header until I hear back from Gigabyte. Sin says he thinks max amp is .5 or .6. So for now I need to figure out hot to run 2 4 pin fans on 2 4 pin headers and get same volts. Would yellow (rpm) disconnected from one leg and tied to the other leg work for this? I just can't seem to get a handle on these fan headers.

    EDIT: or setup somehow so power is drawn from the psu directly but rpm is controlled by cpu fan header.
    Last edited by boondocks; 04-24-2012 at 11:30 PM.
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  5. #85
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    Default Re: Wiring 2 fans to one header

    I have several fans in my system using a fan controller to manually control each fan's speed.
    With this setup, I have an additional YELLOW wire from each fan connected to a different fan header so that I can view the speed of each fan using CPUID Hardware Monitor.

    With two 4-pin PWM fans you should be able to use the following setup for each fan:
    • RED and Black fan wires are connected to a molex adapter from the power supply.
    • YELLOW and GREEN wires for each fan are connected to the appropriate 4-pin fan header connections where each fan's GREEN + YELLOW wire pairs are connected to a different 4-pin fan header.
    I have not tried using this setup.

    YELLOW is the rpm sense wire.
    GREEN is the PWM control wire that automatically adjusts the fan's speed.
    Note: The GREEN wire might have a different color, depending on the manufacturer.

    I will be very surprised (and very disappointed) if each fan header can't safely support at least 2 amps (24 watts) of current.
    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
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  6. #86
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    Default Re: Wiring 2 fans to one header

    Additional 4-pin PWM information:

    Motherboard (CPU) 4 Pin Fan Connector Pinout - AllPinouts

    4-Wire PWM Controlled Fans Specification:
    http://www.formfactors.org/developer...1_2_Public.pdf

    I have several different PWM cables and the wire colors are different on some cables.

    In the previous post, I'm assuming:
    Red = +12 volts
    Black = ground (or earth)
    Yellow = rpm sense wire
    Blue or Green = PWM digital control

    Hope this helps to clarify everything.
    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
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    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
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  7. #87
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    Default Re: Wiring 2 fans to one header

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  8. #88
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    Default Re: Wiring 2 fans to one header

    Quote Originally Posted by profJim View Post
    I have several fans in my system using a fan controller to manually control each fan's speed.
    With this setup, I have an additional YELLOW wire from each fan connected to a different fan header so that I can view the speed of each fan using CPUID Hardware Monitor.

    With two 4-pin PWM fans you should be able to use the following setup for each fan:
    • RED and Black fan wires are connected to a molex adapter from the power supply.
    • YELLOW and GREEN wires for each fan are connected to the appropriate 4-pin fan header connections where each fan's GREEN + YELLOW wire pairs are connected to a different 4-pin fan header.
    I have not tried using this setup.

    YELLOW is the rpm sense wire.
    GREEN is the PWM control wire that automatically adjusts the fan's speed.
    Note: The GREEN wire might have a different color, depending on the manufacturer.

    I will be very surprised (and very disappointed) if each fan header can't safely support at least 2 amps (24 watts) of current.
    Only boards I have ever seen with 2 A fan headers have been Asus X58 boards, even newer Asus boards only support 1 A per header.
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    Gigabyte GA-Z77X-UDH5
    i7-3770K @ 4.5 GHz, XSPC Raystorm
    G.Skill Ripjaws X 2* 4 GB
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  9. #89
    boondocks's Avatar
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    Default Re: Wiring 2 fans to one header

    Quote Originally Posted by profJim View Post
    I have several fans in my system using a fan controller to manually control each fan's speed.
    With this setup, I have an additional YELLOW wire from each fan connected to a different fan header so that I can view the speed of each fan using CPUID Hardware Monitor.

    With two 4-pin PWM fans you should be able to use the following setup for each fan:
    • RED and Black fan wires are connected to a molex adapter from the power supply.
    • YELLOW and GREEN wires for each fan are connected to the appropriate 4-pin fan header connections where each fan's GREEN + YELLOW wire pairs are connected to a different 4-pin fan header.
    I have not tried using this setup.

    YELLOW is the rpm sense wire.
    GREEN is the PWM control wire that automatically adjusts the fan's speed.
    Note: The GREEN wire might have a different color, depending on the manufacturer.

    I will be very surprised (and very disappointed) if each fan header can't safely support at least 2 amps (24 watts) of current.
    I think you will be disappointed. But thanks very much for the information!
    Cool. Thanks.
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    Case Labs SM8 w/dual pedestals / Custom water w/ acrylic pipe / Light box
    PowerColor 390Xw/EK block / Samsung 840 Pro 256GBx2 RAID 0 / 128GBx1 SSD's | 3 HDD's / DVD burner
    Dual Aquaero 5 Pro controllers for pumps & fans / FC9 for led's only 2xD5 pwm w/Bitspower tops - MCP35x2 - 3x480 rads/1x240 rad/AP15 fans / EK supremcy
    Seasonic Platinum 1000w custom fabbed/sleeved psu wiring by me

    Wifes: Z77X-UD5H / 3770K w/c with Raystorm copper block & 2 Rads/ Kingston HyperX RAM / Switch 810 case/ PowerColor AX7950 w/EK block
    HTPC: Z68 Pro3 M / 2105

    SOLD:Z97X-UD5H /4790K/F11b mod BIOS/4.8@1.38 4x4GB Kingston Genesis KHX24C11X3K4 2400 RAM 11-13-13-30
    SOLD:Z87X-UD5H /4770K


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