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5v power consumption

Discussion in 'General Hardware' started by cdawall, Oct 22, 2012.

  1. cdawall where the hell are my stars

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    What is the typical 5v power consumption of a computer? I am trying to figure out if I can run all of my high end fans at 7v. I have 4 fans that are rated for 3.3A@12V and 4 that are rated for 3.9A@12V. I know not to backfeed into a powersupply, but what is the safe amount to run off of the 12V+5V?
     
  2. Frick

    Frick Fishfaced Nincompoop

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    That depends on which line you're running them at. I'm not sure I understand your question. The 12V lines are rated at 25A each and the 5V line is rated at 30A.
     
  3. cadaveca

    cadaveca My name is Dave

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    This depends on the number of HDDs,. SSDs, and USB devices. There is no "set" average, that i can tell. First power up is where your problem will be, I dunno that anyone really checks this currently, honestly. From suer reports of issues, I coudl say that Corsair did not consider number of HDDs at startup with some PSUs...


    I'd suggest to get a proper fan controller to do this.
     
  4. cdawall where the hell are my stars

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  5. cadaveca

    cadaveca My name is Dave

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    Then find a controller design and build your own with breadboard?

    Most PSUs are 150W-180W for 5 V, with drives and other things, I do not think this is such a good idea. Older rigs, sure, but not so much with modern ones.

    or get one of those GPU add-on PSUs for it...
     
  6. cdawall where the hell are my stars

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    The issue isn't the wattage when you use the 12V and 5V rails to create a "7V" rail you backfeed 5V@whatever amperage into the 5V rail. While this isn't a huge issue when you have multiple HDD's, many many USB devices etc. The issue comes when you start to do what I am doing and running multiple high amp fans off of the "7V" rail.
     

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