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Thread: -5V for what?

  1. #1
    Join Date
    Aug 2009
    Dallas, TX

    Default -5V for what?


    My PSU has no -5 volt lead on the 24 pin main power connector. I am guessing this is used for power phase generation. Googling didn't turn up any answers. The motherboard (EP45) manual says it has pin expecting -5V, and my system has only been pulling 220W during heavy loads including a 70W GPU load. So I am out to make it happy and feed it what it asks for. Any ideas on how to mod the -12V or invert another +12V to -5V? I'm sure I can figure out a circuit for it, but I don't know what type of load to expect on the -5V cause I don't know what its for. Any ideas?
    Gigabyte EP45-DS3R | E8500 3.16Ghz | 4GB Corsair XMS 1066 | Sapphire HD4850 675/993 | 2x Hitachi 250GB RAID 0 | Bios F11e | Cooler Master CM690

  2. #2
    Join Date
    Sep 2002
    Central Alberta , Canada

    Default Re: -5V for what?

    I was curious about the same thing recently. My PSU tester has a -5 light on it and I noticed that it only worked with older PSUs. A bit of research (and yes I too had a tough time finding answers with Google) later it seems that the -5 lead has been useless for a while now and is no longer a part of the newer ATX standard. If anyone has a different answer please feel free to correct me.
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  3. #3
    Join Date
    Nov 2008
    Florida, USA

    Default Re: -5V for what?

    Before there were PCI and PCIe there was ISA. Boards using ISA interface required -5v.
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  4. #4
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
    Join Date
    Jan 2008
    PCB Island

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