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Thread: What is -12v for?

  1. #1
    Newbie
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    Nov 2000
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    Beresford,NB,Canada
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    Post What is -12v for?

    I wonder what is the -12v for on a mobo?
    I'm building a dc-dc power supply and I just can't make the -12v yet!

  2. #2
    Low Bitrate
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    Nov 2000
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    grandeprairie alberta canada
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    Post

    not much of anything i've heard

  3. #3
    Variable Bitrate
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    Jul 1999
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    Greensboro NC
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    Post

    as usual this has been answered here before...if you need more in depth just do a search on the msg board.....but the jist of it is that you don't always need it but some video cards and sound cards need it to operate....you can try testing your system without it and see if everything works...if it does you don't have to worry about it.....

    Catlas

  4. #4
    Retired Admin Aaron Cake's Avatar
    Join Date
    Jan 2000
    Location
    London, Ontario, Canada
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    2,464

    Cool

    -12V is required by the serial port, and by some video and some sound cards. A lot of people say it's not necessary, but really that's just a cop out. If it wasn't necessary, it wouldn't be available on newer power supplies anyway, and it certainly wouldn't have made the jump to the ATX platform. So, it is a good idea to design it into your supply. Remember that you will need -5V as well.

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    Aaron Cake
    London, Ontario, Canada

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