Intel X5472 Mechanical Design Guidelines - Page 33
Characterizing Cooling Solution Performance Requirements, 2.4.1 Fan Speed Control
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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 TCASE of the processor at a given power level. Since the TCASE of a processor is an 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 TCONTROL as explained in Section 2.2.6, is to be used in FSC designs to ensure that the long-term reliability of the processor is met while keeping the system level acoustic noise down. Figure 2-14 depicts the relationship between TCONTROL and FSC methodology. Figure 2-14. TCONTROL and Fan Speed Control Once the TCONTROL value is determined as explained earlier, the DTS temperature reading from the processor can be compared to this TCONTROL value. A fan speed control scheme can be implemented as described in Table 2-6 without compromising the long-term reliability of the processor. Quad-Core Intel® Xeon® Processor 5400 Series TMDG 33