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Actually on all new Intel desktop boards, there is a new features called ProcHot and it is the CPU Die temperature. It is within the range of 0 < Temperature < -100 Celsius.
temperature at which the CPU will start throttling itself in order to remain cool enough. Throttling means skipping clock cycles.
If it is showing ProcHot -21 C, it indicates that the cpu have 21 degrees to go to make the cpu to start throttling itself.
If it returns 0, the CPU will assert prochot and start throttling.
First thing to do is to:
1) CMOS clear then,
Update the Bios to the latest one Version using the recovery mode:
I think that this board has an option called Intel Management Engine Bios.
You can access the MEBx bios by pressing Ctrl+P.
Some board needs to have the settings enabled in the Bios in order to access it.
Bios >> Boot Configuration >> Intel ME Setup Prompt: Enable.
Go into the Ctrl + P MEBx Bios
Intel ME COnfiguration >> Enter
Intel Quiet System Technology >> Enable.
Save and Exit
After the BIOS Update, try to read the temperature from the BIOS.
a) Advanced >> Hardware Configuration
ProcHot must be negative.
For example, if the temperature is -21C, this means that it is still ok, as you have 21 more degrees to go for it to be critical.
b) Use the tools from Intel to read the temperature
CPU Temperature Website: http://ark.intel.com
If you have temperature higher than 75C using the Intel Desktop Utilities, then it can be due to any of these:
a) bad integration
b) PSU not ATXv2.2
c) Chassis is not TAC (Thermally Advantage Chassis)
Try different bios version
Hope this may help you.