Computer's Technology Is trend to High Speed CPU, nowadays. However, high speed CPU will generate a huge Thermal Energy proportionally. The Thermal Energy will transfer as CPU Heat and subsequently it will affect the system performance. In the worst cases, if the CPU heat is over certain limit it will causes the system hang-up. Therefore, the way to work out this problem is to improve processor heat dissipation through increased surface area and concentrated airflow from attached fans. In addition, interface materials allow effective transfers of heat from the processor to the heat sink. If you are not sure which CPU heat sink Is suitable for you AMD CPU, please refer to following website. The entire CPU heat-sink model which is listed on this website had been approved by the AMD.
Http://www1.amd.com/products/athlon/thermals