Platform Environment Control Interface
Platform Environment Control Interface, abbreviated as PECI, is a recent (introduced in 2006) technology used for thermal management in the Intel Core 2 Duo processors. The main difference between PECI and the previously used thermal sensors is that PECI reports the negative value expressing the difference between the current temperature and the thermal throttle point (at which the CPU shuts down itself to prevent damage from overheating) instead of the absolute temperature as usual. So, for example, for a typical CPU with maximal temperature of 85°C and the current temperature of 35°C, the value reported by PECI would be -50°C.
Another difference compared to classical thermal diodes is that PECI uses digital thermal sensors (DTS). See section 5.3 of [1] for more information.
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