Date: Mon, 7 Nov 2005 15:47:08 -0500 (EST) From: "Michael Lieske" <micahjon@ywave.com> To: <bill@wiliweld.com> Cc: freebsd-questions@freebsd.org Subject: Re: Diagnosing reboot under load Message-ID: <1217.128.208.250.149.1131396428.squirrel@webx1.neonova.net> In-Reply-To: <20051107094015.R55967@liam.billschoolcraft.com> References: <436E739E.8020605@ywave.com> <436E7599.9090003@cs.earlham.edu> <436E7D4E.6080707@ywave.com> <F3441A15-7CD9-4B7E-8AE9-359B59658C82@u.washington.edu> <436E9DF0.1080408@ywave.com> <436F1779.7090807@u.washington.edu> <436F6B5F.9000304@ywave.com> <20051107100935.31771357.wmoran@potentialtech.com> <20051107102617.3abfd2c5.wmoran@potentialtech.com> <436F896B.2040404@dial.pipex.com> <436F8E2E.802@ywave.com> <20051107094015.R55967@liam.billschoolcraft.com>
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> At Mon, 7 Nov 2005 it looks like Micah composed: > >> Alex Zbyslaw wrote: >>> Bill Moran wrote: >>> >>>> Bill Moran <wmoran@potentialtech.com> wrote: >>>> >>>> >>>>> Micah <micahjon@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 I wasn't checking amps because everything I've read says that a bad supply will show voltage fluctuations. I just stuck the probes into available +5 and +12 lines (seperate tests) and let it sit in min/max mode for a while. Later, Micah
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