Mr5oh :
And if you are using the MSI command center on an MSI board, the temp is correct.
No, it's all too frequently NOT correct.
Motherboard utilities provided by the manufacturer on their Driver DVD typically measure CPU temperature, NOT Core temperature.
Core temperature is the standard for thermal measurement because it's consistently more accurate than CPU temperature.
Core temp is an excellent utility, and even better is Real Temp, which was developed specifically for Intel processors: Real Temp - http://www.techpowerup.com/downloads/2089/real-temp-3-70/
A single Analog Thermal Diode centered under the Cores measures "CPU" temperature, which is the overall temperature of the entire processor. The Analog value is converted to Digital (A to D) by the Super I/O (Input / Output) chip on the motherboard, then is calibrated to look-up tables coded into BIOS, upon which the accuracy of CPU temperature depends.
The monitoring utilities provided by motherboard manufacturers on your Driver DVD reads CPU temperature. Thermal code can vary greatly between BIOS suppliers and version updates, and can be wrong by more than 30C.
BIOS or CPU temperature may not be accurate.
Core temperature is the temperature measured directly on the hot spots within each Core by individual Digital Thermal Sensors (DTS). Core temperature sensors are factory calibrated by Intel, which are NOT dependent upon BIOS for accuracy.
Intel desktop processors have thermal sensors for each Core, plus a sensor for the entire processor, so a Quad Core has five sensors. Heat originates within the Cores where Digital sensors measure Core temperatures. A single Analog sensor under the Cores measures overall CPU temperature.
Core temperature is 5C higher than CPU temperature due to the differences in sensor type, location and calibration. Intel's Thermal Specification is "Tcase", which is CPU temperature,
not Core Temperature. Tcase for the popular i5 4690K is 72C. Tcase + 5 makes the corresponding Core temperature 77C.
The relationship between Core temperature and CPU temperature is not in the Thermal Specifications; it's only found in a few engineering documents. In order to get a clear perspective of processor temperatures, please read this Tom’s Sticky:
Intel Temperature Guide -
http://www.tomshardware.com/forum/id-1800828/intel-temperature-guide.html
Thanks,
CT
on this very confusing topic!
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