AMD AMD-K6-2/500AFX Data Sheet - Page 312
Airflow Management in a System Design, Airflow for a Heatsink with Fan
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AMD-K6®-2 Processor Data Sheet Preliminary Information 21850J/0-February 2000 A heatsink and fan combination can deliver much better thermal performance than a heatsink alone. More importantly, with a fan/sink the airflow requirements in a system design are not as critical. A unidirectional heatsink with a fan moves air from the top of the heatsink to the side. In this case, the best location for the voltage regulator is on the side of the processor in the path of the airflow exiting the fan sink (see Figure 109). This location guarantees that the heatsinks on both the processor and the regulator receive adequate air circulation. Airflow Ideal areas for voltage regulator Figure 109. Airflow for a Heatsink with Fan Airflow Management in a System Design Complete airflow management in a system is important. In addition to the volume of air, the path of the air is also important. Figure 110 shows the airflow in a dual-fan system. The fan in the front end pulls cool air into the system through intake slots in the chassis. The power supply fan forces the hot air out of the chassis. The thermal performance of the heatsink can be maximized if it is located in the shaded area, where it receives greatest benefit from this air exchange system. 292 Thermal Design Chapter 17