Intel E1400 - Celeron 2.0GHz 800MHz 512KB Socket 775 Dual-Core CPU Design Manual 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. Please consult the local representative for your preferred vendor
for their product plans and availability.
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40 Thermal and Mechanical Design Guidelines