[Noisebridge-discuss] computer PSU questions - is 5.5V normal for 5V?

[Rameen]

I just tested my PSU with my multimeter not too long ago. I set it up on two
or three fans, and a harddrive. I noticed that some of the output voltages
were possibly .2 off, but it was consistent through-out each respective
pin-out, and I didn't note it bouncing very much. They generally stayed at
the voltages of the random resource I was using for molex pin-outs. Just to
be clear, though, I never had any known problems with the PSU.

 Generally if the motherboard reads good voltages, it supplies the PSU with
a voltage (I think it's the green wire?) which keeps the PSU running. Often
times the BIOS on your system will also give you voltage read-outs if you're
able to acquire those for real-time measurements. Not sure what state your
system is in... Ultimately, I'd suggest running your system with a good PSU
and see how that goes. Otherwise maybe the manufacturers have some advice
about the power supply if they're willing to share?

On Mon, Aug 9, 2010 at 5:42 PM, Joel Jaeggli <joelja at bogus.com> wrote:

> On 8/8/10 3:44 PM, travis+ml-noisebridge at subspacefield.org<travis%2Bml-noisebridge at subspacefield.org>wrote:
> > Just wondering what the tolerances are.  I had a 550W PSU that was
> > making the system act flaky.  Hooked it up to PSU tester and it's
> > bouncing randomly from 5V up to 5.5V, and 3.3V is bouncing around up
> > to 3.5.  The other lines (12V) are rock solid.
>
> the voltage is undoubtedly higher when it's not under load. The 12v rail
> has some relatively constant loads on it like the 3.5 disk spindles you
> should see it fluctuate a bit if you have big 12v loads like a graphics
> card or a 95w intel cpu... +- 5% is totally normal.
>
>
> >
> >
> >
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