Intel® Quiet System Technology (Intel® Qst); Intel ® Qst Algorithm - Intel CELERON PROCESSOR E3000 - THERMAL AND MECHANICAL DESIGN Design Manual

Intel® Quiet System Technology (Intel® QST)
7 Intel
Technology (Intel
In the Intel 965 Express Family Chipset a new control algorithm for fan speed control
is being introduced. It is composed of an Intel Management Engine (ME) in the
Graphics Memory Controller Hub (GMCH) which executes the Intel Quiet System
Technology (Intel QST) algorithm and the ICH8 containing the sensor bus and fan
control circuits.
The ME provides integrated fan speed control in lieu of the mechanisms available in a
SIO or a stand-alone ASIC. The Intel QST is time based as compared to the linear or
state control used by the current generation of FSC devices.
A short discussion of Intel QST will follow along with thermal solution design
recommendations. For a complete discussion of programming the Intel QST in the ME
Consult the Intel
Manual.
Note: Fan speed control algorithms and Intel QST in particular rely on a thermal solution
being compliant to the processor thermal profile. It is unlikely that any fan speed
control algorithm can compensate for a non-compliant thermal solution. See Chapter 5
and Chapter 6 for thermal solution requirements that should be met before evaluating
or configuring a system with Intel QST.
7.1 Intel
The objective of Intel QST is to minimize the system acoustics by more closely
controlling the thermal sensors to the corresponding processor or chipset device
T
CONTROL
control algorithm and a Fan Output Weighting Matrix. The PID algorithm takes into
account the difference between the current temperature and the target (T
rate of change and direction of change to minimize the required fan speed change.
The Fan Output Weighting Matrix uses the effects of each fan on a thermal sensor to
minimize the required fan speed changes.
Figure 7-1 shows in a very simple manner how Intel QST works. See the Intel Quiet
System Technology (Intel
discussion of the inputs and response.
Thermal and Mechanical Design Guidelines
®
Quiet System
®
Quiet System Technology (Intel
®
QST Algorithm
value. This is achieved by the use of a Proportional-Integral-Derivative (PID)
®
QST) Configuration and Tuning Manual for a detail
®
QST)
®
QST) Configuration and Tuning
), the
CONTROL
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