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.
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