Does a modern motherboard (BIOS) measure CPU temps off the CPU itself or from a sensor underneath the CPU that acutally measures heat like a case temp gauge? I've seen the sensor before but not now on newer motherboards.
My problem is gauging the temps on my E8400. Coretemp reads the same temp at any speed when idle 59/63 and over 90c at 1.45v and 4.3Ghz. The CPU never throttles or shuts down. When I grab and feel around the heatsink it's barely warm--nothing even close to my Q6600 or E6400. Coretemp always starts off at 59/63. The temps match each other once I prime and they rise passed 63c. That would be 30 degrees more on a overclock (not like my other CPUs where it's 20c).
I've read that other people are having similar issues while some are not. So basically, is it better to watch the motherboard CPU temp sensor because it has its own sensor. Or is it too reading from the CPU diodes? EasyTune (Gigabyte) CPU temps seems a bit off too, around 75-80c on load. To me, I simply can't feel 176F in my case.
There are 2 temperature sensors in the Core 2 Duo processors. One is an analog device called the thermal Diode. The new one is the Digital Diode that works with the new PECI interface. If the board is trying to work with the Thermal diode for the Wolfdale processor ie(E8500, E8400) then there will be a problem. Intel states that they must work with the PECI interface to work with the Digital diode. The Diode does work correctly. The motherboard/bios/software is the one at fault.