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Thread: Cpu fan on gene-z

  1. #1

    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 harly +10
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    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

  4. #4
    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
    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.
    http://en.wikipedia.org/wiki/Fan_control


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