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Thread: Cpu fan on gene-z

  1. #1
    ROG Member Array
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    Jan 2012

    Cpu fan on gene-z

    Hi! I've recently came close to finishing my first build, but a slight problem occured. My cpu cooler fan has 3 pin connector (thermalright axp-140), but my gene-z mobo as you know has 4 pin slots for fans. So I have a question, will fans work if I connect them to 4 pin slot? What problems there may be? If they'll work I'll probably wont be able to monitor and/or change fan speed or something like that? Thanks in advance.

  2. #2
    ROG Enthusiast Array
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    Jan 2012

    As I understand it, the two CPU headers only control 4-pin fans. 3-pin fans will run at max speed. The 3 Chassis headers will control 3 or 4 pin fans though.

    I also read that in a recent bios change that one of the chassis controllers (fan 3 maybe?) goes off the CPU temp not the mobo temp, a change made for your very circumstance. Someone posted that in these forums. I haven't confirmed if it is true though, so take that with a huge grain of salt unless you can confirm it somewhere authoritative.

  3. #3
    ROG Guru: Grand Master Array HiVizMan's Avatar
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    Dec 2011

    Thanks for that tit bit harly

    if I get a chance today I will put my Gene on the test bench.

  4. #4
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    Jan 2012

    Thanks! That bios option would be great, it would be nice if someone could confirm it or even better, teach how it's done

  5. #5
    ROG Guru: Yellow Belt Array puma99dk| PC Specs
    puma99dk| PC Specs
    MotherboardAsus Maximus VIII Gene
    ProcessorIntel Core i5-6600K
    Memory (part number)Crucial Balistix 16gb @ 2400mhz
    Graphics Card #1MSI GTX 970 Gaming 4G
    Sound CardAsus Thunder FX
    MonitorYamakasi Catleap Q270 @ 120hz
    Storage #1Intel 535 240GB
    Storage #2Intel 535 480GB
    CPU CoolerCorsair H80i
    Power SupplySeaSonic X-760 80PLUS Gold
    OS Windows 10 Pro x64
    Network RouterAsus Dark Knight AC
    puma99dk|'s Avatar
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    Feb 2011

    the forth wire is usually used for PWM fans (Pulse-width modulation.)

    i use two Noctua NF-P12 with 3pin connectors on my Noctua NH-U12P SE1366 and i have never had a problem not even on my Gene-Z/Gen3 i use both CPU and OPT fan connector.

    Pulse-width modulation

    Pulse-width modulation (PWM) is a common method of controlling computer fans. A PWM capable fan is usually connected to a 4-pin connector (pinout: Ground, +12V, sense, control). The sense pin is used to measure the rotation speed of the fan and the control pin is a open-drain or open-collector output, which requires a pull-up to 5V or 3.3V in the fan. Unlike linear voltage regulation, where the fan voltage is proportional to the speed, the fan is driven with a constant supply voltage; the speed control is performed by the fan based on the control signal.

    The control signal is a square wave operating at 25kHz, with the duty cycle determining the fan speed. Typically a fan can be driven between about 30% and 100% of the rated fan speed, using a signal with up to 100% duty cycle. The exact speed behaviour (linear, off until a threshold value, or a minimum speed until a threshold) at low control levels is manufacturer-dependent.

    i5-6600K | Corsair H80i @ 2xNoctua NF-F12 PWM
    Asus Maximus VIII Gene Bios 0402 | Crucial Balistix 2x8gb @ 2400mhz (16-16-16-39 Tx)
    MSI GTX 970 Gaming 4G @ 1328/1752mhz (Boost)
    Intel 535 240gb SSD @ Win10 Pro UK x64 | KIS2016
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    Anime/DATA: 2xWD Red 4TB@Orico 3.0USB
    Audio-Technica ATH-M50 Red @ Asus ThunderFX & Logitech Z-2300 @ SupremeFX
    SeaSonic X-760 80PLUS GOLDIE

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