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  1. #1
    Joined
    Dec 2001
    Location
    Gold Coast - Australia
    Posts
    120

    Question Do I have a potential PSU problem?

    I have searched the forums and read quite a few threads regarding power issues with a PSU but non quite fit my issue.

    I have a Topower 420 PSU that's now about 4 years old.

    Some time ago MBM5 started reporting my +5 rail at about 4.85v and whilst this was still within the spec got me wondering why.

    Recently I change my mobo for the one in my sig and the low voltage was still being reported a multimeter on a molex plug shows the voltage as 4.97V when MBM5 shows 4.85 - okay so far.[12V is MBM5 12.29, Multimemter @ 12.2]

    When running prime in torture test the +5 drops to 4.7v with MBM5 which is out of spec but the multimeter shows a drop to 4.95V on a molex plug

    My question is in two parts 1. why would the power fluctuate at all with a software application? 2. is my PSU still appropriate for the newer mobo and chipset/CPU?

    Thanks
    Abit AV8 3rd Eye
    AMD64 3000+ @ 3500+
    GeForce 6600GT
    2 x 512 Corsair XMS DDR PC3200
    WD 160 + Seagate 80 @ 7200 IDE
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  2. #2
    Joined
    Aug 2003
    Location
    Where the beavers roam
    Age
    36
    Posts
    11,750

    Re: Do I have a potential PSU problem?

    Does your PSU have a 12V square EXTRA ATX plug? Your motherboard requires an extra 4-pin square ATX 12V plug. If you don't have it, then yes, you could have some potential problems.

    Software can definitely cause voltage fluctiuations. When your pc comes under load, then the voltage will fluctuate. The harder your PC works, the harder it is to maintain constant voltage

  3. #3
    Joined
    Dec 2001
    Location
    Gold Coast - Australia
    Posts
    120

    Re: Do I have a potential PSU problem?

    Now your confusing me, there is only one power connector on the A7N8X-E and the plug from the PSU fits fine, there is no square aux plug but a number of molex plugs for the drives etc.

    As this PSU is not in production anymore I can't give you any specs other than the amps on the +5V are 42 amps with the 3.3 @ 26 amps and the 12 volt @ 18 amps
    Last edited by djmorgan; 05-20-2004 at 08:13 AM.
    Abit AV8 3rd Eye
    AMD64 3000+ @ 3500+
    GeForce 6600GT
    2 x 512 Corsair XMS DDR PC3200
    WD 160 + Seagate 80 @ 7200 IDE
    Pioneer A07XLB
    Pioneer A08XLB
    XP Pro SP2

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