From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rudolf Marek Date: Mon, 30 Jul 2007 13:57:09 +0000 Subject: Re: [lm-sensors] w83627dhg and coretemp temperature mismatch? Message-Id: <46ADEE35.3010603@sysgo.com> List-Id: References: <1185800852.23876.91.camel@pancake> In-Reply-To: <1185800852.23876.91.camel@pancake> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit To: lm-sensors@vger.kernel.org Hi Florian > Thanks - I suspected something along these lines. But why is the > external sensor then giving a higher temperature reading than the > internal sensors? Is there some sort of compensation built in, because > the mainboard manufacturer wants to stay on the safe side? (The > difference seems to be around 4-5 °C). > I'm the author of coretemp driver. Intel wont tell the Tjmax temperature as described in the documentation so the temperature might be a bit off. Because the CPU provides only a relative temperature to hottest possible, one can say that: temp1: +42°C (high = +85°C) "85-42" C (relative to TjMax) so you are still 43C bellow dangerous level. In other words if you get close to 85C it is bad, If the temperature reported by coretemp reaches 85C CPU will start to switch itself on and off. The optimal point when to start massive cooling is set by intel usually 85-16 = 69C To sum it up. You are absolutely safe until 69C reported by coretemp. Above this temperature you need to cool the CPU bit more, so it never reaches 85C. Hope it is clear, I'm in office and so in hurry ;) -- S přátelským pozdravem / Best regards / Mit freundlichen Grüßen Ing. Rudolf Marek SYSGO s.r.o. Zelený pruh 99 CZ-14800 Praha 4 Phone: +420 222138 627, +49 6136 9948 627 Fax: +420 296374890, +49 6136 9948 1 627 rudolf.marek@sysgo.com http://www.sysgo.com | http://www.elinos.com | http://www.pikeos.com _______________________________________________ lm-sensors mailing list lm-sensors@lm-sensors.org http://lists.lm-sensors.org/mailman/listinfo/lm-sensors