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Thread: Gigabyte Fan Headers

  1. #1
    Join Date
    Nov 2012
    United States

    Question Gigabyte Fan Headers


    I have a new GA-A75-UD4H Gigabyte motherboard that I am building a system with and I have questions about the fan headers.

    There are 4 fan headers on this motherboard. These are CPU_FAN, SYS_FAN, SYS_FAN2, PWR_FAN. According to the manual, two of these are speed controlled; CPU_FAN and SYS_FAN. I know that CPU_FAN is controlled by a CPU temperature sensor. It is my understanding (which may not be correct) that SYS_FAN is not controlled by CPU temperature. SYS_FAN is controlled by a different temperature sensor. My first question is, where is the sensor that controls SYS_FAN located? Is it the A75 chipset temperature sensor?

    Also, am I correct in assuming that SYS_FAN2 and PWR_FAN run at 100% at all times? What components do system builders usually target by fans that are connected to SYS_FAN2 and PWR_FAN?


    Larry Tate

  2. #2
    Join Date
    Dec 2010
    Near Toronto but not in it

    Default Re: Gigabyte Fan Headers

    SYS_FAN typically uses the systems temperature on the MB. SYS_FAN2 and PWR_FAN are normal 3 pin fan headers that typically only have 12V (100%) power on them.

    I'll use them as an input/output fan to keep the air in the case fresh and circulated.

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