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Thread: Wiring 2 fans to one header




  1. #11
    boondocks's Avatar
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    Default Re: Wiring 2 fans to one header

    Thanks! I'm going to copy that so I can keep track of it.
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  2. #12
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    Default Re: Wiring 2 fans to one header

    Okay, so I have the 212+ cooler, 4 pin fan on one side, 3 pin fan on the other side. How do I wire this? Also the 3 pin fan wires are clear, not colored.
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    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

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  3. #13
    Lsdmeasap's Avatar
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    Default Re: Wiring 2 fans to one header

    If you want, I can link you to the pins, wires, and connectors so you can later build your own that doesn't look so bad (I mean so it doesn't look like a hack job is all ). If you want some links for later let me know!

    You want to connect the 3 pin RPM wire to it's own fan header molex, using only the RPM wire, if you want to monitor it's RPMs (If not, do not use it). And then the ground and power should be spliced together into it's own separate header, you don't want the RPM's spliced together into one header as it wont readout speeds properly if you do that.

    As for which wires are which, see here because it's hard to explain depending on how you are looking at the connector, see second image as the first one has the cable colors mixed up!
    Motherboard (CPU) 3 Pin Fan Connector Connector Pinout - AllPinouts

    It's always Black/ground on one side, yellow RPM on the other side, Red/Power in the middle, depeding on how you look at it decides which side is RPM and which is the ground.

    The second image above shows the connector and cable colors properly, also see the Intel links at the bottom of that page

  4. #14
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    Default Re: Wiring 2 fans to one header

    Haha thanks, that saves me a long post about finding the ground wire and counting from there... depending on the connector and how you are viewing it...

    I did draw this diagram of my ideal fan splitter (3p and 4p fans, with 2nd fan rpm feedback):
    Wiring 2 fans to one header-241mb-jpg
    - Z68X-UD3H-B3(rev 1.3), bios F12
    - I5-2500k [3148C059], cooled by scythe mugen2 rev.b with 1500rpm pwm-fan on cpufan header.
    - 8G(2x4G) Corsair Vengeance LP CML8GX3M2A1600C9W,Low profile/Low voltage, DDR1600/C9-1.35v. Slots 1&2.
    - 16G(4x4G) Samsung M378B5273DH0-CH9 1333 @ 2133-c11. w1.55v

    - Seasonic M12D SS850-EM , 850W Semi-Modular PSU with 80A at 12V.
    - 2x EVGA GeForce GTX285-1GB in SLi, 4x 6pin power and bridge connected.[PCIEX_16 and PCIEX_8]
    - Hauppauge HVR2200 PCIE 1x tv-tuner card.[PCIEX1_3]
    - Intel controller in raid mode.
    - 2x WD 500G blacks in raid0 on intel port 0-1.
    - 1x WD 1000G black on intel port 2.
    - 1x OCZ Vertex2 (32nm) on intel port 3.
    - 1x Optiarc DVDRW on intel port 4.
    - 1x Samsung 500G on marvell port 0.
    - 24" LCD monitor @ Geforce 0, lower HDMI port.
    - 17" LCD monitor @ Geforce 0, upper HDMI port.
    - 19" LCD tv @ intel/onboard HDMI.
    - 4ch analoge speakers, cambridge dtt set.
    - internal spdif header connected to Geforce 0.
    - front usb connected.
    - front ac97 connected.
    - front cardreader (usb) connected.
    - rear 4x usb bracket.
    - ms media keyboard, ms comfort mouse. usb, wired.
    - w7x64-sp1.



  5. #15
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    Default Re: Wiring 2 fans to one header

    That looks good, but 3 pin male would only have power/ground connected, and the RPM wire. I assume you know that, just looks odd in your image of the bottom right 3/4p male fan

  6. #16
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    Default Re: Wiring 2 fans to one header

    Darkje, is your design "patent pending"?
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  7. #17
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    Default Re: Wiring 2 fans to one header

    I have no patent on this, but maybe apple already has

    I ment it to be with the 4p connectors you can use for 3p as well, the ones with a slighty wider gap on one side, like in the picture on pg1. Ofcourse assuming the board has a 4p cpu fan header. If you would start out from a 3p mobo header, the bleu wire would just not be there, but it would still work, with both fans regulated, and feeding back rpm.
    It may look odd, but it does work. The only odd thing I see is the yellow wire feeding back to a second header on the mobo?
    - Z68X-UD3H-B3(rev 1.3), bios F12
    - I5-2500k [3148C059], cooled by scythe mugen2 rev.b with 1500rpm pwm-fan on cpufan header.
    - 8G(2x4G) Corsair Vengeance LP CML8GX3M2A1600C9W,Low profile/Low voltage, DDR1600/C9-1.35v. Slots 1&2.
    - 16G(4x4G) Samsung M378B5273DH0-CH9 1333 @ 2133-c11. w1.55v

    - Seasonic M12D SS850-EM , 850W Semi-Modular PSU with 80A at 12V.
    - 2x EVGA GeForce GTX285-1GB in SLi, 4x 6pin power and bridge connected.[PCIEX_16 and PCIEX_8]
    - Hauppauge HVR2200 PCIE 1x tv-tuner card.[PCIEX1_3]
    - Intel controller in raid mode.
    - 2x WD 500G blacks in raid0 on intel port 0-1.
    - 1x WD 1000G black on intel port 2.
    - 1x OCZ Vertex2 (32nm) on intel port 3.
    - 1x Optiarc DVDRW on intel port 4.
    - 1x Samsung 500G on marvell port 0.
    - 24" LCD monitor @ Geforce 0, lower HDMI port.
    - 17" LCD monitor @ Geforce 0, upper HDMI port.
    - 19" LCD tv @ intel/onboard HDMI.
    - 4ch analoge speakers, cambridge dtt set.
    - internal spdif header connected to Geforce 0.
    - front usb connected.
    - front ac97 connected.
    - front cardreader (usb) connected.
    - rear 4x usb bracket.
    - ms media keyboard, ms comfort mouse. usb, wired.
    - w7x64-sp1.



  8. #18
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    Default Re: Wiring 2 fans to one header

    The only odd thing I see is the yellow wire feeding back to a second header on the mobo?
    Nothing odd about it, as you can confirm that both fans are spinning at nearly identical speeds when the second fan header's yellow wire reports the fan speed for the second cpu heatsink cooling fan.
    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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  9. #19
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    Default Re: Wiring 2 fans to one header

    Yeah, well it's kind of optional, you could use it for slightly different fans or an exit fan in the rear or top of the case. Or if you don't need indication of the 2nd fan rpm's, you don't have to plug the single yellow one at all.

    I do feel there is one more thing I should mention, and that is to make sure the 2 fans together don't exeed 0,5A,so you don't overload the header.
    Last edited by Darkje; 03-03-2012 at 06:46 PM.
    - Z68X-UD3H-B3(rev 1.3), bios F12
    - I5-2500k [3148C059], cooled by scythe mugen2 rev.b with 1500rpm pwm-fan on cpufan header.
    - 8G(2x4G) Corsair Vengeance LP CML8GX3M2A1600C9W,Low profile/Low voltage, DDR1600/C9-1.35v. Slots 1&2.
    - 16G(4x4G) Samsung M378B5273DH0-CH9 1333 @ 2133-c11. w1.55v

    - Seasonic M12D SS850-EM , 850W Semi-Modular PSU with 80A at 12V.
    - 2x EVGA GeForce GTX285-1GB in SLi, 4x 6pin power and bridge connected.[PCIEX_16 and PCIEX_8]
    - Hauppauge HVR2200 PCIE 1x tv-tuner card.[PCIEX1_3]
    - Intel controller in raid mode.
    - 2x WD 500G blacks in raid0 on intel port 0-1.
    - 1x WD 1000G black on intel port 2.
    - 1x OCZ Vertex2 (32nm) on intel port 3.
    - 1x Optiarc DVDRW on intel port 4.
    - 1x Samsung 500G on marvell port 0.
    - 24" LCD monitor @ Geforce 0, lower HDMI port.
    - 17" LCD monitor @ Geforce 0, upper HDMI port.
    - 19" LCD tv @ intel/onboard HDMI.
    - 4ch analoge speakers, cambridge dtt set.
    - internal spdif header connected to Geforce 0.
    - front usb connected.
    - front ac97 connected.
    - front cardreader (usb) connected.
    - rear 4x usb bracket.
    - ms media keyboard, ms comfort mouse. usb, wired.
    - w7x64-sp1.



  10. #20
    profJim's Avatar
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    Default Re: Wiring 2 fans to one header

    I think that Lsdme once said that modern fan headers can safely support up to about a 2 amp (24 watt) combined electrical load.
    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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