Is 14 volts to high for PSU 12 output ?

Discussion in 'Asus' started by Bill Schaible, Jan 8, 2006.

  1. I put in a new, less-noisy PSU - an ASPIRE AS420W model. It is a 'bulk' PSU
    and there is very little info for it on the internet. The A7V266 BIOS says
    the 12 volt power is 13.4 volts. ASUS Probe says it's 14.1 volts. I
    believe there was very close agreement between BIOS and Probe for the old
    PSU that I replaced with the ASPIRE. I have no idea why the two values are
    so different now. But more important, the value was within 5% for the old
    PSU. I am concerned that the higher voltage from the ASPIRE will cause
    stress on something and cause a hardware failure. But maybe the high
    voltage is Ok - I don't know. Maybe it's supposed to be this way, so if the
    PC creates a higher load on the 12v output the voltage goes down but stays
    within acceptable range. The load condition where I get the 13.4 and 14.1
    readings consists of 2 hard drives and 3 expansion cards and CPU load less
    than 5%. I can take this PSU back to the store and get an exchange. But
    maybe the high voltage is Ok. I would appreciate hearing what anyone here
    thinks about the high voltage readings and why there is such a difference
    between the values reported by BIOS and Probe.
    Bill Schaible, Jan 8, 2006
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  2. I'd check with a DVM first, but say exchange it. The on-board voltage
    sensors, are not that accurate, but no ATX supply should not be outside
    +/-10% (many of the rails are required to be tighter than this). Even the
    lower figure, puts you really out of spec. The normal reason for this, is
    a PSU, that is regulated on one rail only, and is heavily loaded on this
    rail, with not as much load as expected on the other. If the machine is
    lightly loaded on the 12v rail, but relatively more heavily loaded on the
    5v rail, and the supply is one that regulates on the 5v line, then this
    sort of value would be seen. If the rail really is at 14.1, then it is not
    just bad, but awful...

    Best Wishes
    Roger Hamlett, Jan 8, 2006
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  3. Bill Schaible

    DaveW Guest

    You risk burning out some of your computer components with that
    over-voltage. Return it.
    DaveW, Jan 10, 2006
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