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? on computer power supply?

  1. Aug 19, 2012 #1
    I decided to use 1 power supply to run my computer and one to run my fans is the a bad idea?
    2 fans in the front 2 fans in the back and 1 fan on the side and 1 fan under my graphics card.
  2. jcsd
  3. Aug 19, 2012 #2


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    Why would you want to do that? How do you propose to start up the fans at the same time as the computer? You'd need to manually start the power supply dedicated to the fans first every time you started the computer.
  4. Aug 19, 2012 #3
    well the power supply is not from a computer but has the same voltage and i know to start the fans first it seems to work.
  5. Aug 19, 2012 #4


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    But why would you want to do that?
  6. Aug 19, 2012 #5
    i didn't want to over tax my powers supply
  7. Aug 19, 2012 #6


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    By connecting the the fans straight to the psu you will lose the temperature-speed control provided by the motherboard?

    Whats the pc spec and the psu wattage?
  8. Aug 19, 2012 #7
    whats psu wattage?
  9. Aug 19, 2012 #8
    here the computer that i have but i did pout it in a different case http://www.geeks.com/details.asp?inv...&CJPID=4176654 [Broken]
    Last edited by a moderator: May 6, 2017
  10. Aug 19, 2012 #9
  11. Aug 21, 2012 #10

    Check this site for a calculator to find out if you would be overloading your PSU or not. personally i have an Apower 1000w PSU running two gtx275's in SLI with 4 am3 cpu coolers on them, an amd phenom II x6 @4.0ghz, asus xonar dx sound car(using 3.5" cable), 4gb ddr3 1333(generic), OCZ agility 3 60gb sata 3, 2x 1tb WD1TB green 7200rpm sata 3, samsung bluray drive sata 3, and 8x 120mm fans and a 200mm fan. (antec 1200 case)

    All of my power cables are in use apart from one Sata Power, my pc runs perfectly. according to that site i only use 722w

    It feels like i use a lot more, but fans dont use much power compared to hard drives and graphics cards and so on.
  12. Aug 21, 2012 #11


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    How many fans do you have? Computer fans won't take up more than a few watts each.

    Sure, there is nothing wrong with multiple power supplies, but there isn't really a use based on the OPs needs.
  13. Aug 22, 2012 #12
    2 fans in the front 2 fans in the back and 1 fan on the side and 1 fan under my graphics card.
  14. Aug 22, 2012 #13
    That's difficult to say from the description. Power supplies are one of the biggest con jobs left in the PC industry. It's a stupid 12v power supply, but the industry is so under regulated only a few companies have become reputable for producing quality products and people are willing to grossly over pay just to insure their power supply doesn't fry their computer. You can buy a power supply with the same rated output for anywhere from 18 bucks to 150 and the older they get more risky the crappy ones become. Often they don't even put the amount of power they are advertised for when brand new.
  15. Aug 22, 2012 #14
    your totally right, majority of the time they just put a "estimated maximum output" for example you may buy a 1000w psu and its maximum output is only 720 or 480w in some cases, better the brand the closer the esitmation. for a pc running only 6 fans you could get away with a normal non branded 18 buck powersupply.
  16. Aug 23, 2012 #15
    Power supplies that come with brand name computers have gotten a little better in recent years, but they still tend to have marginal output and I can't blame people for being cautious. I never thought of it before, but adding an 18 dollar power supply like that is one way you could cheaply ensure you could add something like a modern graphics card for gaming or whatever. Plug the fans and anything else you can into the external power supply and it could make the difference between the computer frying or crashing all the time when you try to play games or whatever.
  17. Aug 23, 2012 #16
    Ok thank you guys :)
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