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Thread: Dual Sproggys

  1. #1
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    Question Dual Sproggys

    Has anyone tried to run dual sproggys a modern ATX mobo?

  2. #2
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    Mar 2003
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    dual power supplies

    You know, I see this sort of thing a lot. It really doesn't work well.

    The power supply works by measuring the voltage at the output. If you have 2 of these with the outputs connected together, one is going to have a slightly lower threshold than the other one. This device is the one that's always going to be supplying juice while the other one with the higher threshold is essentially off.

    This will continue until the lower threshold device overheats and shuts down.

    Even if you split up the 5V wires between the power supplies, they're still connected on the motherboard. There may be enough resistance between them so that it works OK, but it's not guaranteed.

  3. #3
    FLAC Mastero's Avatar
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    DIODES


    is the key word here ... !


    so no return is allowed ... .. think about it ...

    Mastero

  4. #4
    FLAC cproaudio's Avatar
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    Originally posted by Mastero
    DIODES


    is the key word here ... !


    so no return is allowed ... .. think about it ...

    Mastero
    Are you willing to take a .7 volt drop for every diodes used? There are resistances to diodes too which in turn will produce heat. Doesnt the PSU send ground signals to the motherboard and vice versa so the PSU knows the mb is on? After you diode and isolate the 2 PSUs the motherboard sees 11.3v, 4.3v and 2.6v.
    NEW complete and updated My project with 100+ pics on 7-4-03
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  5. #5
    Maximum Bitrate MikeHunt79's Avatar
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    I've used dual sproggies, with no problems. They were isolated from each other tho.
    One up front powering the lcd and dvd drive (no 3.3v rail needed).
    One in the boot/trunk powering the motherboard, cpu and HD.
    Never tried connecting the outputs together tho, and I`m not sure if i`d want to now.

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