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Thermal/Mechanical Reference Design
2.4
Characterizing Cooling Solution Performance
Requirements
2.4.1
Fan Speed Control
Fan speed control (FSC) techniques to reduce system level acoustic noise are a
common practice in server designs. The fan speed is one of the parameters that
determine the amount of airflow provided to the thermal solution. Additionally, airflow
is proportional to a thermal solution's performance, which consequently determines the
T
of the processor at a given power level. Since the T
CASE
important parameter in the long-term reliability of a processor, the FSC implemented in
a system directly correlates to the processor's ability to meet the Thermal Profile and
hence the long-term reliability requirements. For this purpose, the parameter called
T
CONTROL
long-term reliability of the processor is met while keeping the system level acoustic
noise down.
methodology.
Figure 2-14. T
CONTROL
Once the T
reading from the processor can be compared to this T
control scheme can be implemented as described in
the long-term reliability of the processor.
Quad-Core Intel® Xeon® Processor 5400 Series TMDG
as explained in
Section
Figure 2-14
depicts the relationship between T
and Fan Speed Control
value is determined as explained earlier, the DTS temperature
CONTROL
2.2.6, is to be used in FSC designs to ensure that the
CONTROL
Table 2-6
of a processor is an
CASE
and FSC
CONTROL
value. A fan speed
without compromising
33
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