Intel E2160 Design Guide - Page 38

Intel

®

Core

TM

2 Duo E6400, E4300, and Intel

®

Pentium

®

Dual-Core E2160 Processor—Intel®

Quiet System Technology (Intel® QST)

Intel

®

Core

TM

2 Duo E6400, E4300, and Intel

®

Pentium

®

Dual-Core E2160 Processor

TDG

October 2007

38

Order Number:315279 -003US

6.0

Intel® Quiet System Technology (Intel® QST)

In the Intel

®

965 Express Chipset family, a new control algorithm for fan speed control

is being introduced. It is composed of a Manageability 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

®

Quiet System Technology (Intel® QST) Configuration and Tuning

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

and

Chapter 6.0

for thermal solution requirements that should be met

before evaluating or configuring a system with Intel QST.

6.1

Intel

®

QST Algorithm

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

value. This is achieved by the use of a Proportional-Integral-Derivative (PID)

control algorithm and a Fan Output Weighting Matrix. The PID algorithm takes into

account the difference between the current temperature and the target (T

CONTROL

), the

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

shows in a very simple manner how Intel QST works. Refer to the

Intel®

Quiet System Technology (Intel® QST) Configuration and Tuning Manual

for details of

the inputs and response.

Section	Page
Intel® CoreTM 2 Duo E6400, E4300, and Intel® Pentium® Dual-Core E2160 Processor: Thermal Design Guide	1
Contents	3
Figures	5
Tables	5
Revision History	6
1.0 Introduction	7
1.1 Document Goals and Scope	7
1.1.1 Importance of Thermal Management	7
1.1.2 Document Goals	7
1.1.3 Document Scope	7
1.2 References	9
1.3 Definition of Terms	9
2.0 Processor Thermal/Mechanical Information	11
2.1 Mechanical Requirements	11
2.1.1 Processor Package	11
2.1.2 Heatsink Attach	12
2.2 Thermal Requirements	14
2.2.1 Processor Case Temperature	14
2.2.2 Thermal Profile	15
2.2.3 Tcontrol	16
2.3 Heatsink Design Considerations	17
2.3.1 Heatsink Size	17
2.3.2 Heatsink Mass	18
2.3.3 Package IHS Flatness	18
2.3.4 Thermal Interface Material	18
2.4 System Thermal Solution Considerations	19
2.4.1 Chassis Thermal Design Capabilities	19
2.4.2 Improving Chassis Thermal Performance	19
2.4.3 Summary	19
2.5 System Integration Considerations	20
3.0 Thermal Metrology	21
3.1 Characterizing Cooling Performance Requirements	21
3.1.1 Example	22
3.2 Processor Thermal Solution Performance Assessment	23
3.3 Local Ambient Temperature Measurement Guidelines	23
3.4 Processor Case Temperature Measurement Guidelines	25
4.0 Thermal Management Logic and Thermal Monitor Feature	26
4.1 Processor Power Dissipation	26
4.2 Thermal Monitor Implementation	26
4.2.1 PROCHOT# Signal	27
4.2.2 Thermal Control Circuit	27
4.2.3 Thermal Monitor 2	28
4.2.4 Operation and Configuration	29
4.2.5 On-Demand Mode	30
4.2.6 System Considerations	30
4.2.7 Operating System and Application Software Considerations	31
4.2.8 THERMTRIP# Signal	31
4.2.9 Cooling System Failure Warning	31
4.2.10 Digital Thermal Sensor	31
4.2.11 Platform Environmental Control Interface (PECI)	32
5.0 Intel® Reference Thermal Solution	33
5.1 Thermal Solution Requirements	33
5.2 PICMG 1.3 Form Factor	34
5.3 ATX/BTX form factors	36
5.4 Altitude	36
5.5 Geometric Envelope for Intel Reference PICMG 1.3 Thermal Mechanical Design	37
6.0 Intel® Quiet System Technology (Intel® QST)	38
6.1 Intel® QST Algorithm	38
6.1.1 Output Weighting Matrix	39
6.1.2 Proportional-Integral-Derivative (PID)	39
6.2 Board and System Implementation of Intel® QST	41
6.3 Intel® QST Configuration and Tuning	43
6.4 Fan Hub Thermistor and Intel® QST	43
Appendix A LGA775 Socket Heatsink Loading	44
A.1 LGA775 Socket Heatsink Considerations	44
A.2 Metric for Heatsink Preload for Designs Non-Compliant with Intel Reference Design	44
A.2.1 Heatsink Preload Requirement Limitations	44
A.2.2 Motherboard Deflection Metric Definition	45
A.2.3 Board Deflection Limits	46
A.2.4 Board Deflection Metric Implementation Example	47
A.2.5 Additional Considerations	48
A.3 Heatsink Selection Guidelines	49
Appendix B Thermal Interface Management	50
B.1 Bond Line Management	50
B.2 Interface Material Area	50
B.3 Interface Material Performance	50
Appendix C Case Temperature Reference Metrology	51
C.1 Objective and Scope	51
Appendix D Mechanical Drawings	52

Intel E2160 Design Guide - Page 38

Intel® Quiet System Technology (Intel® QST), 6.1 Intel® QST Algorithm, Intel, QST Algorithm

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