Where does these values come from ?

Discussion in 'Gigabyte' started by Aamir, Jan 4, 2005.

  1. Aamir

    Aamir Guest

    My qs are as follows;
    1. how does the motherboard calculates the rpm of fan(s)
    2. the votages are given like this +5V, +12V etc and these start from
    zero thats wht i think. but the motherboard show from -3.22V to +5 V.
    my qs is if the negative side increases does it have some kinda of
    effect on the overall voltage? (voltage diff is increasing but max +5V
    remains same)
    Aamir, Jan 4, 2005
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  2. Aamir

    SteveK Guest

    there is a hardware monitor chip on the mobo type ITE8705/12F etc.
    it reports temperatures and fan rpms
    forget the negative voltage values - it's mostly incorrect metered
    only the positive voltage values are correctly metered
    SteveK, Jan 5, 2005
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  3. Aamir

    Steve Sweet Guest

    Hi "Aamir"

    Fans with 3 wires have what is called a Tachogenerator on them, chips on the
    motherboard use this signal to report RPM from the motor.
    Any unwelcome voltage change spells trouble.


    (º·.?(?*·.? ?.·*?)?.·º)
    «.·°·. Steve .·°·.»
    (?.·º(?.·?* *?·.?)º·.?)
    Steve Sweet, Jan 5, 2005
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