Where are temp sensors located on a motherboard?

iamtrout

Diamond Member
Nov 21, 2001
3,001
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Today I overclocked my A64 3000+ from 2.0GHz to 2.5GHz and I just ran Prime95 to test out the stability.

Within ten minutes one of my temperatures shot up from 40C to over 60C.

MBM tells me that it sees three temp sensors on my board, one for the CPU, one for the mobo, and a mysterious "auxiliary." The auxiliary is the one that shot up over 60C. I have both the mobo chip and the CPU watercooled, and by the looks of it, whatever is the aux is definitely not watercooled because it's been ten minutes since I stopped Prime95 and the aux temperature is still at 55C.

Any ideas what part of my mobo this aux sensor is measuring? I have a Shuttle AN51R, nForce3 250GB, and the sensor in question is IT8712F #3.
 

Nickel020

Senior member
Jun 26, 2002
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Usually motheboards give 3 temperature readings; CPU, Northbridge and the temp of the monitoring chip itself which many people refer to as the "system" temp. I guess what you are reading is the temp of the monitoring chip and it is probably located near some heatsources giving you this high temp. Also note that temps never are very accurate.
 

iamtrout

Diamond Member
Nov 21, 2001
3,001
1
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Thanks for the link! It was most helpful. I managed to find the location of three of the thermistors, which is weird, because they are for case temp, MOSFETs, and CPU... no mobo chip. Motherboard Monitor is only reading three temps too, MOSFET, CPU, and case.

In the following picture are the locations of where the thermistors should be. The case and MOSFET ones have been positively identified, but I can't see one for the CPU and neither my eyes nor my software can see one for my mobo. I'm new at this thermistor location stuff. Is it odd to not see a thermistor for the CPU and also for a mobo temp reading to be nonexistent?

http://img.photobucket.com/alb.../AN51R-thermistors.jpg
 

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