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PSU checked with multimeter.

Discussion in 'General Hardware' started by buckstar, Jun 14, 2012.

  1. buckstar New Member

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    Been having problems with my new build since i built it from random BSOD's to slow computing. After posting numerous threads about my problems nothing has solved my issues so far. I have sent my cpu off to amd for RMA? I will hear soon on that so. decided to check my psu for it's voltages using a multimeter results are as follows.

    (Powercool 550 watt 80+ psu)


    +12v 11.78 ( 1 case fan connected )_ 11.52v (2 case fans connected)- should voltages drop? when you add more fans etc?
    +5v 5.16
    +3.3 3.41
    -12v 11.38

    are these reasonble volts for my system?
    also is 550watt psu enough power for my system

    asus fm1 m pro m/board
    amd a8 3870k cpu
    8gig 1866 mhz memory
    hd 6670 g/card
    wireless network card pci/e
    3 usb devices keyboard/mouse etc
    dvd rw
    250gig hard drive
    2 case fans
  2. robal

    robal

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    Your voltages are fine, but more load is necessary to detect whether it drops too low.
    Also, you won't detect spikes and excessive ripple with multimeter.

    Long story short, the only "at home" way to check the PSU is to test the PC with another one and check whether it was PSU that introduced instability.

    Cheers

    EDIT: BTW: Have you tried running stability testing tools like memtest86 ? If not, your problem may be software related.
    buckstar says thanks.
  3. buckstar New Member

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    yes ran memtest86 memory is fine. could have a motherboard issue , just a process of elimination. or like u said could be software, i have installed windows n drivers that many times im edgeing more to hardware
  4. Law-II

    Law-II

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    Hi

    If you get a chance the next time you log in, fill in your system specs and OS in UserCP, will save you having to write it out again.

    can you confirm your memory is this CORSAIR CMZ8GX3M2A1866C9(XMP) 8GB(2 x 4GB) DS - - 9-10-9-27 1.50V

    will help others in the TPU community have a better understanding of the issues you have been up against

    atb (all the best)

    Law-II
  5. Derek12

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    +12V too low with only 2 fans.
    95Viper says thanks.
  6. buckstar New Member

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    can confirm that this is the memory i am using :CORSAIR CMZ8GX3M2A1866C9(XMP) 8GB(2 x 4GB) DS - - 9-10-9-27 1.50V
    Law-II says thanks.
  7. AthlonX2

    AthlonX2 HyperVtXâ„¢

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    If your 12v line is really dropping that low with two fans connected your psu is most likely junk. two fans pull around 1 - 1.3A so if that little power is pulling the psu down that low image what a full system is doing.
    95Viper says thanks.
  8. Jetster

    Jetster

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    How many times did you format and reinstall? You really should list all your parts including software. Also run a Linux disk and see if it runs ok. I really doubt its your CPU
  9. Jstn7477

    Jstn7477

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    Chances are the PSU is group regulated, meaning the voltage of the 5v rail or 3.3v rail determines how much the PSU increases/decreases all the voltages (look how high the 5v and 3.3vv are in relation to the 12v rail). Attach a hard disk to the PSU and run your tests again. You'll probably see a big difference because you are not loading more than one rail from one voltage output.
    buckstar says thanks.
    Crunching for Team TPU More than 25k PPD
  10. slyfox2151

    slyfox2151

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    you need more load on the psu to get reliable data....
    you cant test it with zero load.... or next to it.



    plug in your system then test it with a multi meter while running. im not saying the psu is not the issue and it more then likely is, however the tests you have done so far give no evidence as the psu is not designed to run 10 watts of power with perfect voltage.


    if you google some psu tests where they use very little to no load on the psu you will notice wierd issues some psus have.


    (note* not every psu has this problem with low/no load.)


    EDIT:
    after googleing, Powercool is a terrible brand of psu and should be avoided at all costs.
    INSTG8R says thanks.
  11. buckstar New Member

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    will do another test and look again
  12. DarkOCean

    DarkOCean

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    +1
  13. buckstar New Member

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    tried the test again with hard drive connected and you are spot on got good readings on all lines. think that rules out psu faulty cheers

    rails i mean

    +12v 12.02

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