Diagnosing reboot under load
Bill Schoolcraft
bill at wiliweld.com
Mon Nov 7 17:44:50 GMT 2005
At Mon, 7 Nov 2005 it looks like Micah composed:
> Alex Zbyslaw wrote:
>> Bill Moran wrote:
>>
>>> Bill Moran <wmoran at potentialtech.com> wrote:
>>>
>>>
>>>> Micah <micahjon at ywave.com> wrote:
>>>>
>>>>
>>>>> I'm running the i386 version of FreeBSD with 1gb ram. Didn't think to
>>>>> check this before, but I'm getting ~112-113 volts into the PSU from the
>>>>> surge strip. I'm probably going to get a new PSU today. The parts
>>>>> store has a couple of 400 watters in the $50 range (a fortron and a
>>>>> thermaltake).
>>>>>
>>>>
>>>> Cheap power supplies are a near guarantee that your computer will be
>>>> unstable. Unfortunately, $cheap doesn't always == quality cheap.
>>>>
>>>
>>> I recommend the more recent one as a guage for what manufacturers you
>>> can trust. Frankly, if you're only spending $50 on a 400W, you're
>>> probably getting a piece of junk - although Fortron has been rating
>>> well in Tom's tests.
>>>
>> A PSU actually capable of 350W *ought* to have done you fine, but many
>> cheap PSUs, as Bill says, just don't cut it. I'd personally recommend a
>> Seasonic, which won't be cheap, but will be quiet and reliable if mine is
>> anything to go by. Antec also seem to have a reasonable rep.
>>
>> There's a nice wattage claculator here:
>> http://www.jscustompcs.com/power_supply/Power_Supply_Calculator.php?
>>
>> --Alex
>
> Thanks for the link. I actually used that calculator when I pieced this
> machine together.
>
> I'm really beginning to doubt it's the PSU. Why? I cannot get the output
> voltage to drop no matter what load I throw at it. I plugged in four
> additional hard drives and ran a system stress test and still the voltages
> remained rock steady at the values I stated earlier. I ran it for an hours
> with the high-low monitor on a Fluke multimeter. The +5 stayed near 5.1 with
> 5.08 as the bottom, and the +12 stayed near 11.89 with 11.84 as the minimum.
> I even had one of the "random segfaults" and the +12 voltage never dropped
> below 11.84. I'm not sure how I can get the load any higher without using
> resistors which most certainly does not simulate the load I'm generating
> while compiling.
Hello,
How were you using the Fluke meter to test amperage? I was not
aware that it would work with a ground line embedded inside the
power cable?
I currently have a Fluke-T5-600 and I'm curious about the above
test. http://www.tequipment.net/FlukeT5-600VoltageTester.html
Thanks
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