It depends on your DTS sensors and how far below zero you are. In theory, the temperature data is being stored internally in the CPU in 7 bits of data so at most you can get down to 95C-127 = -32C.
I don't know if the previous 65nm sensors have any sticking issues when things get cold but I know you'd probably have to go through quite a few E8400 processors before you got lucky and found one that could go that low without at least one of the sensors, and probably both, sticking at a fixed temperature.




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