multiple power supplies!

I have so many case fans, they are all pretty quiet too. But i need them because often i run without the AC on and i live in florida, where it can get quite hot. I have a couple spare atx power supplies and i was wondering if there was a way to get them to turn on without having to connect them to a computer.
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  1. well i already figured it out, all i hadda do was use a paperclip to short out pins 14 and 15 on the atx connector! the 5V line still goes low though heres my info, anyone know why this is happening?

    +5V 4.72-4.78V
    -5V 5.45V
    5VSB 4.99V
  2. Yeah... its the green line into a black one that does it.


    Regarding your dipping 5v line. Its basically becauze your cpu/mobo is drawing too much load and the PSU cannot handle it.

    at 4.75v or less u may experience instability and random crashes or reboots.

    And cauz its all from one source you cant really share the load between multiple PSU's.

    You NEED a better PSU man.
    Preferably a quality one from enermax, antec or toptower. (my favorites)

    <b>"If spam wasn't totally bogus, Hotmail users would be well-endowed, slim people with hair who make big money working at home and having great sex provoked by free porn and herbal Viagra.</b>
  3. hmmmm, now this leads to the question, why cant a 350W psu support *only* 2 hdd's? It really seems crazy to me. I have a HP here with an athlon XP1700, 1hdd and a cdrw and it only has a 200W PSU!!! Does this mean manufacturers like HP are grossly underpowering their systems? Or does it mean companies like enermax are grossly overrating their PSU's? I tend to think its the psu companies. I also have a spare pc power cooling turbo cool 350 ATX here (which says 220W max as opposed to my 185W max on the enermax). I plugged that one in and low and behold the voltages were even worse! The +12V was 11.71V and the -12V was -11.45V! But the 5V was better at +4.8 to +4.86 and -5V was -5.2V! This is very weird... How powerful of a psu do i need? I want it to be reasonably quiet too, my bedroom is not a landing strip lol
  4. it could just be that the PSU is partially fried or on its way out.

    And yes, ive noticed that OEM's sell PSU's that do the job, but no more.

    dont worry too much about the negative voltages, they only carry about 1amp max, and often vary considerably.

    its the 12v and 5v lines that are of importance...they should ideally be within 5% of ideal. i.e. 4.75 to 5.25 for 5V and 11.4 to 12.6v for 12v.

    <b>"If spam wasn't totally bogus, Hotmail users would be well-endowed, slim people with hair who make big money working at home and having great sex provoked by free porn and herbal Viagra.</b>
  5. Well i just disconnect all of the hdd from the psu and went into bios and it maintains 4.81V in bios. So its only the mobo, ram, cpu fan, chipset fan, tv card, geforce2mx, nic, and keyboard/mouse. Its still low! This just isnt right, im going to see what enermax has to say about it...
  6. Heres an email i got from a pcpowercooling tech, its more responsible then paperclip technology lol:)


    Hi Jason,

    Using an additional power supply just for your case fans won't save you any electricity.

    But you can install two power supplies if you want to. Just make sure that the hard drive that you boot from is the one that is connected to the power supply that is connected to the motherboard. Also, you are going to need a way to turn on the second ATX power supply independently of the first one. I recommend you buy an ATX to AT conversion cable for $8, plus a push-button switch for $2. You won't need to connect the AT motherboard power connectors to your motherboard, but you need to use the two wires that attach to the push-button switch so you can turn the second power supply on and off as needed.

    By the way, make sure you always turn on the second power supply first, and turn off the second power supply last.

    Look at the above-mentioned products at this link:
    http://www.pcpowercooling.com/prices/index_access.htm

    Let me know if you have more questions.

    By the way, you are not going to save any electricity doing this. You will just split the load up over two power supplies.



    Best Regards,

    Mick Keily
    Tech Support
    PC Power & Cooling, Inc.
    (800) 722-6555
    (760) 931-6988 FAX
  7. Use this picture to see how you have to connect 2 ATX PSUs with eachother so they both start-up: <A HREF="http://www.waterkoeling.nl/files/voeding.gif" target="_new">http://www.waterkoeling.nl/files/voeding.gif</A>

    But don't connect the grey power good signal with a ground... connect it to the other PSUs power good line instead.

    My dual-PSU PC is so powerfull that the neighbourhood dims when I turn it on :eek:
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