Date: Tue, 13 Mar 2012 14:59:41 +0100 From: Peter Maloney <peter.maloney@brockmann-consult.de> To: freebsd-amd64@freebsd.org Subject: Re: High temperature on FreeBSD Message-ID: <4F5F52CD.6020501@brockmann-consult.de> In-Reply-To: <ff54c2af168f8afc4d655e9d35750121.squirrel@mail.sc.rimed.cu> References: <55bab9b4e06a3e7fdd200f58df624291.squirrel@mail.sc.rimed.cu> <1331437108.5557.10.camel@btw.pki2.com> <ff54c2af168f8afc4d655e9d35750121.squirrel@mail.sc.rimed.cu>
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Am 12.03.2012 03:29, schrieb alina@sc.rimed.cu: >> You have a cooling or hardware problem. The problem isn't FreeBSD. > Thanks you everybody but if it's a hardware problem then why i didn't have > it in Fedora; the problem did not appear at this time, i install the > system and !bum! the first shutdown for thermal reasons (was only coping > my backup). > > Maybe the OS affects the fan speed somehow, but you still can't say it is FreeBSD, since you haven't tested it enough. Maybe your Fedora usage just never heated it up. Maybe your fan quit recently, after the last time you heated it up. Maybe it is because winter has ended, etc.. Also check the bios for fan settings, and consider turning off automatic fan speed control if low noise isn't too important for you. Definitely clean the fan and heat sink. I think compressed air in a can is the way the pros do it. A vaccum cleaner on reverse does a good job. If it doesn't have reverse, it takes more skill or much more power to get all the dirt without taking it apart. Don't take the heat sink off and put it back on... it will kill your cooling. If you did, see next paragraph. Also, clean out any dirt anywhere else, such as the power supply fan, video card, etc. while you are at it. If you removed the heat sink any time during the life of the machine, you destroyed the thermal goo. To put the heat sink back on, you need new goo. This means scubbing off the old goo using rubbing alcohol, making sure the surface is smooth, then reapplying fresh goo (buy expensive goo... it costs double [$0.20 instead of $0.10... pennies] but it is worth it). Then when putting the heat sink on, make sure it is firmly and evenly attached. If not, figure out what went wrong (happened to me once with a 3rd party heat sink, and I had to file something down and put the cpu in slightly crooked for it to press evenly). If it dries up before you are done, then clean again and repeat with new goo. (it probably takes a day to dry though). Using old goo means it is not goo, but solid, and after you pulled and stretched it, it, it has bubbles and cracks in it. Then do a good test. eg. listen to the fan to estimate if it runs faster in FreeBSD or Fedora (obviously this would be a rough measurement, but sometimes there are 3-4 settings that you can hear differently). Make it run hot (compile something on both OSses), and feel it with your hand. Don't trust software that reads sensors unless you tested it (numbers might not be comparable with different software, and sometimes it is just plain wrong. eg. I have a server that says it is -40°C). If you have a thermometer, use that. Make sure to give it time to heat up.
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