Output Weighting Matrix; Proportional-Integral-Derivative (Pid); Figure 21. Intel Quiet System Technology Overview - Intel QX9770 - Core 2 Extreme Quad-Core Processor Design Manual

Intel core 2 extreme processor qx6800 and intel core 2 extreme processor qx9770 thermal and mechanical design guidelines

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Figure 21. Intel

6.1.1

Output Weighting Matrix

Intel QST provides an Output Weighting Matrix that provides a means for a single

thermal sensor to affect the speed of multiple fans. An example of how the matrix

could be used is if a sensor located next to the memory is sensitive to changes in both

the processor heatsink fan and a 2

matrix additional the Intel QST could command the processor thermal solution fan and

this 2

fan to both accelerate a small amount. At the system level these two small

changes can result in a smaller change in acoustics than having a single fan respond

to this sensor.

6.1.2

The use of Proportional-Integral-Derivative (PID) control algorithms allow the

magnitude of fan response to be determined based upon the difference between

current temperature readings and specific temperature targets. A major advantage of

a PID Algorithm is the ability to control the fans to achieve sensor temperatures much

closer to the T

Figure 22 is an illustration of the PID fan control algorithm. As illustrated in the figure,

when the actual temperature is below the target temperature, the fan will slow down.

The current FSC devices have a fixed temperature vs. PWM output relationship and

miss this opportunity to achieve additional acoustic benefits. As the actual

temperature starts ramping up and approaches the target temperature, the algorithm

will instruct the fan to speed up gradually, but will not abruptly increase the fan speed

to respond to the condition. It can allow an overshoot over the target temperature for

a short period of time while ramping up the fan to bring the actual temperature to the

target temperature. As a result of its operation, the PID control algorithm can enable

an acoustic-friendly platform.

Quiet System Technology Overview

CONTROL

LGA775 Socket Heatsink Loading

fan in the system. By placing a factor in this

Thermal and Mechanical Design Guidelines

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