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Intel
6.0
Intel® Quiet System Technology (Intel® QST)
In the Intel
is being introduced. It is composed of a Manageability Engine (ME) in the Graphics
Memory Controller Hub (GMCH) which executes the Intel
®
(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 5.0
before evaluating or configuring a system with Intel QST.
®
6.1
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
value. This is achieved by the use of a Proportional-Integral-Derivative (PID)
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 13
Quiet System Technology (Intel® QST) Configuration and Tuning Manual for details of
the inputs and response.
®
TM
Intel
Core
2 Duo E6400, E4300, and Intel
TDG
38
®
TM
Core
2 Duo E6400, E4300, and Intel
®
965 Express Chipset family, a new control algorithm for fan speed control
®
Quiet System Technology (Intel® QST) Configuration and Tuning
and
Chapter 6.0
for thermal solution requirements that should be met
QST Algorithm
shows in a very simple manner how Intel QST works. Refer to the Intel®
®
®
Pentium
Dual-Core E2160 Processor
®
®
Pentium
Dual-Core E2160 Processor—Intel®
Quiet System Technology (Intel® QST)
®
Quiet System Technology
Order Number:315279 -003US
), the
CONTROL
October 2007
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