Hi Mohit, On Wed, 17 Feb 2010 23:42:14 +0530, mohit chawla wrote: > <http://a.collective-media.net/jump/idgt.phoronix/article_above;sec=article;fold=above;tile=2;sz=300x250;ord=123456789?> > Hello folks, I have been running Mprime successfully for testing the > stability of my i7 system when overclocked. > > But I am concerned about the correctness of the temperatures as shown by > lm_sensors version 3.0.2. > > Here's what I have observed. > > When I power on the computer and check the CPU temperature in the BIOS, it > is usually around 33-34 degrees. But as soon as I boot into my OS (Ubuntu > 9.10 64 bit), lm_sensors show temperature around 23-24 degrees. > I am using sensors_applet for Gnome panel to see the temperatures. > > Now the thing is that just when Gnome is loading(panels coming up, > background loading etc.), I do see that the CPU temperature being around 33 > degrees, coming down in a second or two to 23-24 degrees. > > So, my question is, are these temperatures correct ? In other words, is it > normal that CPU temps are high in BIOS ? It is possible, yes. It all depends on the BIOS implementation, but some BIOS are in a tight busy loop all the time, which keeps one CPU core busy all the time, in turn resulting in a relatively high temperature, basically corresponding to Linux (or any other OS) under moderate load. > Or is it so that when the system is > powered on, CPU temps are usually high & when the OS has loaded, they drop > down ? This is expected as well. The boot process can be pretty CPU-intensive, so it is no surprise to see a high temperature during boot, dropping to a lower value right after boot. > Please help me resolving this scenario, as it could lead to potential > damages to my machine due to inaccuracy of results. Another possibility is that the temperature reported by lm-sensors is inaccurate. If you are using the coretemp driver, it is possible that the critical limit is not known for your CPU model and the driver defaults to the wrong value. This has been an issue in the past, and still is for recent CPU models. The value read by Core CPUs is really a relative one, so it's not really a problem if the current temperature reported by lm-sensors isn't correct. What really matters is that it is significantly lower than the critical limit (and high limit too, if your CPU has one.) As long as this is true, your CPU is safe. -- Jean Delvare http://khali.linux-fr.org/wishlist.html _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
