Intel QX9770 Design Guidelines - Page 38
Platform Environmental Control Interface (PECI), not have an on-die thermal diode
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LGA775 Socket Heatsink Loading Note: Intel® Core™2 Extreme processor QX6800 B3 stepping and QX9770 C0 stepping do not have an on-die thermal diode. The TCONTROL in the MSR is relevant only to the DTS. 4.2.11 Platform Environmental Control Interface (PECI) The PECI interface is a proprietary single wire bus between the processor and the chipset or other health monitoring device. At this time the digital thermal sensor is the only data being transmitted. For an overview of the PECI interface see PECI Feature Set Overview. For additional information on the PECI see the processor datasheet. The PECI bus is available on pin G5 of the LGA 775 socket. Intel chipsets beginning with the ICH8 have included PECI host controller. The PECI interface and the Manageability Engine are key elements to the Intel® Quiet System Technology (Intel® QST), see Chapter 6 and the Intel® Quiet System Technology (Intel® QST) 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. § 38 Thermal and Mechanical Design Guidelines