Intel BX80571E7400 - Core 2 Duo 2.8 GHz Processor Manuallines page 40

Thermal Management Logic and Thermal Monitor Feature
®
QST), see Chapter 7 and the Intel Quiet System Technology Configuration and
Tuning Manual.
Intel has worked with many vendors that provide fan speed control devices to provide
PECI host controllers. Consult the local representative for your preferred vendor for
their product plans and availability.
§
40 Thermal and Mechanical Design Guidelines