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Thread: Wiring 2 fans to one header




  1. #21
    boondocks's Avatar
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    Default Re: Wiring 2 fans to one header

    Hmmm. I only have one header to connect to and that's the 4 pin cpu header. The extra fan I have has only the 3 pin connector, no molex. So I guess I'm going to have to hook it to a 3 pin to molex adapter and run at a constant speed? Which is OK by me in this case, I'm just adding a fan to "pull" on the exhaust side of the 212. The "push" side fan already is connected to the mobo 4 pin cpu fan header. Probably should have bought a 3 speed fan to put on the "pull" side.
    But I'm still a bit confused on the wiring, it would be helpful to me to have a diagram that shows which wire is which in relation to the connector orientation. (tabs on connector that line up with mobo header). But the fan I'm adding is a Cooler Master so I'm assuming they use the same wiring on all their fans? At least in this case I have other Cooler Master fans around here to look at in another pc.
    Be nice if this mobo had 2 cpu fan connectors for us dummies.
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  2. #22
    profJim's Avatar
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    Default Re: Wiring 2 fans to one header

    For optimal performance, common sense tells me that both fans in a push-pull cpu heatsink setup should:
    • be matched or nearly identical fan models
    • spin at the same speed (maybe the pull fan could spin somewhat faster)
    • have the same blade design
    • have similar CFM ratings

    My cpu heatsink fins are partially sealed on each exposed side to help direct air flow.

    Then again, common sense isn't all that common anymore and ain't cracked up to what it used to be ;)

    BTW, a quick web search linked to a post where the poster claimed that Gigabyte tech support replied that 3.4 amps was the maximum allowed current load for each fan header on his P35-DS3L mobo.
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  3. #23
    boondocks's Avatar
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    Default Re: Wiring 2 fans to one header

    The Cooler Master fan I bought was supposed to be a good match for the 212+. Newegg.com - COOLER MASTER R4-C2R-20AC-GP 120mm Case Fan
    except they did not include the 3 to 4 pin adapter as advertised. (I"ve got plenty)
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  4. #24
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    Default Re: Wiring 2 fans to one header

    If this is a bad idea then maybe I'll just add a 140mm fan to the case that I had left over from the Noctua. Trying to get lowest noise solution.
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  5. #25
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    Default Re: Wiring 2 fans to one header

    Okay, that's good. Indeed my 0,5A spec. was from wayback and to be on the safe side of things, I've been looking in manuals but find often the actual rating is not stated there. I wander why, because that's where you would expect to find it...

    anyhow don't hook up two (or even one) high power delta fans to a single header on the board, because even at 2A rating it could burn out, but most normal fans should not be a problem.
    - Z68X-UD3H-B3(rev 1.3), bios F12
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    - 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.



  6. #26
    boondocks's Avatar
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    Default Re: Wiring 2 fans to one header

    The fan I'm adding is rated at .35 Amp is recommended for the 212+. I assume the original fan is similar, so that would yield about .7A if both fans were running wide open.
    So the question still remains if I want to connect both to the 4 pin header, a)can I do this and just cut the signal wire on the 4 pin Y adapter on one of the fans?? Or b) if no adapter just wire only the power and ground into the 4 wire harness from the additional fan?
    Or c)forget about it and eat breakfast?
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  7. #27
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    Default Re: Wiring 2 fans to one header

    I think it will be fine to wire it either way you like, so a and b are both ok, but first do c.
    - 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. #28
    boondocks's Avatar
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    Default Re: Wiring 2 fans to one header

    c accomplished.
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  9. #29
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    Default Re: Wiring 2 fans to one header

    You do not need the extra signal wire if you don't want to monitor that second fan, you can just cut it off at the second fan and or leave it out of the connector at the end of the cable.

    Gigabyte fan headers can handle 3 Amps @ 12V per header. Although this is older info know I assume it's still correct, but if needed I can ask and see if this has been increased lately?
    http://forums.tweaktown.com/gigabyte...tml#post318451

  10. #30
    boondocks's Avatar
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    Default Re: Wiring 2 fans to one header

    I will be at less than 1A so should be no problem. Good to know, though.
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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
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