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Can you power a PC with more than one PSU

By beef_jerky4104
Mar 25, 2007
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  1. Well can you do it? Say I have a 500W ATX PSU, but I don't have enough 4 pin molex connectors. Well for one I should probably get a new PSU, or get a couple of Y-Spliters. But could I use 2 PSUs.

    So could I power all of my core components with the 500W PSU (e.g. Mobo, CPU...).

    And then for DVD/CD-ROM Drives use an old AT PSU. Oh yeah it could also power my molex fans right?

    Would that work?
  2. Bluemouse

    Bluemouse TS Rookie Posts: 405

    Do you have the case room?
  3. foozy

    foozy TS Rookie Posts: 267

    Besides physical case limitations, I don't see why not. As far as I know the PSU operates independently of other components.
  4. Ididmyc600

    Ididmyc600 TechSpot Chancellor Posts: 2,251

    Yeah but arent the ATX spec activated by the Mobo, how would you turn it on, the AT IS ok it just needs hooking up to a power switch.
  5. KingCody

    KingCody TS Guru Posts: 1,568   +7

    SOcRatEs wrote a nice guide on How to build a dual PSU system using 1 power ON button, however that method only works with ATX PSUs.

    since the old "AT" PSUs used a simple DPST on/off switch, you could simply use your own switch (or relay to turn it on and off with the ATX PSU)

    cheers :wave:
  6. MetalX

    MetalX TechSpot Chancellor Posts: 1,909

    Might be worth it to just invest in a new PSU. For a 500W PSU to not have enough molex plugs must mean that either A) it is of low quality and should not be used anyway, or B) you have WAY too many things in your computer using molex plugs.
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