Here's a comprehensive guide encompassing thermal measurements of all Intel Core2 processors, it's a long read but very complete:
http://www.tomshardware.com/forum/22...perature-guide
Not feeling too good after that loss of text, I'll have to be more careful.
I'll give you a short version. When dealing with 45nm processors you'll face different programs which display different temps, this can occur at idle, load or even both. In a nutshell the only number you can rely on for load conditions is the direct reading from the DTS.
The DTS is a sensor which measures the delta (in degrees Celsius) from the threshold at which throttling will occur. So instead of increasing, this number will decrease under load. Unlike other readings this is the only
true reading you'll get from the CPU's sensor, no program will display it differently.
Realtemp is extremely useful in that it displays this parameter for each core along with the capability to test for stuck sensors and to calibrate (to your best) the temperature reading. The latest version of Realtemp uses the TJMax info released at IDF to calculate core temperature (TJMax-Distance to TJMax) but remember idle measurements will never be very accurate.
The final parameter which may be helpful is the motherboard's CPU sensor which is usually around 5c cooler than the core readings, with all 3 of these parameters you can hopefully get the best out of your 45nm gem.
You can download Realtemp 2.75 (beta)
here