Maximum effect "Cooling Fan Manufacturer" of the fins is to extend the CPU surface area, thereby improving the heat dissipation rate. However, which also involves another problem that the heat sink material thermal conductivity - is the rate of heat transfer material. Currently the best thermal performance of gold (gold platinum are good), second only to gold conductive metal is copper. If the "Cooling Fan Manufacturer" to produce copper heat sink, and that the cooling effect will be very good, prices are more able to accept some. But more solid copper ground, the larger difficulty of processing, heavy weight, so we are very difficult to see the use of copper to produce heat sink. "Cooling Fan Manufacturer" is again very popular in copper iron and aluminum, iron rust easy, hard, difficult process, heavy, etc., and aluminum but no such trouble, so the production of aluminum has become the most common heat sink different materials.