Intel Q9450 Design Guidelines - Page 46

Acoustics

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Intel® Thermal/Mechanical Reference Design Information Table 4. ATX Reference Heatsink Performance (D60188-001) for Listed Processors at 95 W Processor Intel® Core™2 Quad Processor Q6000 series at 95 W and Intel® Core™2 Quad processor Q9000 and Q8000 series at 95 W Target Thermal Performance, ca (Mean + 3) 0.33 C/W TA Assumption TA = 40 C NOTES: 1. Performance targets (Ψ ca) as measured with a live processor at TDP. Notes 1 5.2.2 Acoustics To optimize acoustic emission by the fan heatsink assembly, the reference design implements a variable speed fan. A variable speed fan allows higher thermal performance at higher fan inlet temperatures (TA) and lower thermal performance with improved acoustics at lower fan inlet temperatures. The required fan speed necessary to meet thermal specifications can be controlled by the fan inlet temperature and should comply with requirements below. Table 5. Acoustic Results for ATX Reference Heatsink (RCFH-4) Fan Speed RPM Thermistor Set Point Acoustic Thermal Requirements ca Notes 5100 1900 1000 High TA = 38 °C Low TA = 30 °C Low TA = 28 °C 6.6 BA 4.2 BA 0.20 C/W 0.27 C/W Thermal Design Power, Fan speed limited by the fan hub thermistor Minimum fan speed NOTES: 1. Acoustic performance is defined in terms of measured sound power (LwA) as defined in ISO 9296 standard, and measured according to ISO 7779. Table 6. Acoustic Results for ATX Reference Heatsink (D60188-001) Fan Speed RPM Thermistor Set Point Acoustic Thermal Requirements, ca Notes 2900 1800 1000 High TA = 40 °C Low TA = 30 °C Low TA = 28 °C 4.5 BA 3.5 BA 0.33 C/W 0.43 C/W Thermal Design Power, Fan speed limited by the fan hub thermistor Minimum fan speed NOTES: 1. Acoustic performance is defined in terms of measured sound power (LwA) as defined in ISO 9296 standard, and measured according to ISO 7779. 46 Thermal and Mechanical Design Guidelines

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Intel® Thermal/Mechanical Reference Design Information
46
Thermal and Mechanical Design Guidelines
Table 4. ATX Reference Heatsink Performance (D60188-001) for Listed Processors at
95 W
Processor
Target Thermal
Performance,
ca
(Mean + 3
)
T
A
Assumption
Notes
Intel
®
Core™2 Quad Processor Q6000
series at 95
W and Intel® Core™2
Quad processor Q9000 and Q8000 series
at 95 W
0.33
C/W
T
A
=
40
C
1
NOTES:
1.
Performance targets (
Ψ
ca) as measured with a live processor at TDP.
5.2.2
Acoustics
To optimize acoustic emission by the fan heatsink assembly, the reference design
implements a variable speed fan. A variable speed fan allows higher thermal
performance at higher fan inlet temperatures (T
A
) and lower thermal performance with
improved acoustics at lower fan inlet temperatures. The required fan speed necessary
to meet thermal specifications can be controlled by the fan inlet temperature and
should comply with requirements below.
Table 5. Acoustic Results for ATX Reference Heatsink (RCFH-4)
Fan Speed RPM
Thermistor
Set Point
Acoustic
Thermal
Requirements
ca
Notes
5100
High
T
A
= 38 °C
6.6 BA
0.20
C/W
1900
Low
T
A
= 30 °C
4.2 BA
0.27
C/W
Thermal Design Power,
Fan speed limited by
the fan hub thermistor
1000
Low
T
A
= 28 °C
Minimum fan speed
NOTES:
1.
Acoustic performance is defined in terms of measured sound power (LwA) as defined in
ISO 9296 standard, and measured according to ISO 7779.
Table 6. Acoustic Results for ATX Reference Heatsink (D60188-001)
Fan Speed RPM
Thermistor
Set Point
Acoustic
Thermal
Requirements,
ca
Notes
2900
High
T
A
= 40 °C
4.5 BA
0.33
C/W
1800
Low
T
A
= 30 °C
3.5 BA
0.43
C/W
Thermal Design Power,
Fan speed limited by
the fan hub thermistor
1000
Low
T
A
= 28 °C
Minimum fan speed
NOTES:
1.
Acoustic performance is defined in terms of measured sound power (LwA) as defined in
ISO 9296 standard, and measured according to ISO 7779.