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How reliable are motherboard thermal sensors?

M

Muerto

Golden Member
My current CPU temp is 46 C and the case is 29 C. It's been holding steady for about four days now. Before that the CPU and case were holding steady at 48 and 30 C. Is it normal for the temps to change like this?

I have an Alpha PAL6035 HSF and arctic silver thermal compound on the CPU, three 50 mm exhaust fans, and one 80 mm intake fan. Do these temps sound about right? And should they fluctuate like this? Thanks. 🙂
 
I have an ASUS P3BF and I have checked the case temperature with a certified mercury thermometer and found the temperature to be within 0.1 degree C

I checked the case temperature as I could keep the thermometer right against the sensor on the MoBo. I found that the reading was a perfect match against the reading in the BIOS as well as Motherboard Monitor - but the ASUS Probe software gave totally wrong readings.
 
Most of the time due to component tolerances, they are not really very accurate unless they are calibrated. The worst-case that I've heard is +/- 3C if everything is as far off as possible. Still, they are close enough for what they need to do.
 
If the ambient air temp in the room goes up, so will the temps. So this sounds normal. And the probes are usually only good to be used as a general way of seeing if anything has gone drastically wrong in the operating enviroment in your pc. My board manufacture has adjusted the bios temps for the processor by about 10 degrees because the probe on my board touchs the heatsink not the processor directly. Hence the difference between my bios readings and my motherboard monitor programs reading. Hope this answered your question...
 
nearly all of them are pretty accurate
except -

the CPU internal thermo diode sensor of SOME of the ABit BX6/2 motherboards
as far as i know, some of those dont report the correct values
 
The socket thermistor's on AMD chips is very,very,very inaccurate. Sometimes up to 12C off. And on top of that, they are often time compressed by at least a factor of 2.

In most cases, they give no clue as to the range of cpu temp difference from idle to full load. In the best cases, they get you within 2-4C of actual peak cpu core temp(latest bios for a7v and kt7's compensate to try to give this reading).

With an updated bios, they are acceptable for getting a max-full load cpu core temp. For comparisons, they are beyond what is acceptable(accuracy wise) to be compared.

And, temps should fluctuate. Idle to Full load should be anywhere from 10-12C, if being read correctly.


Mike
 
Mike.... there is no thermistor on AMD chips.... they are on the MBs NONE of them are on the chips themselves.
 
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