One "220V Cooling Fan" radiator products, though far from capacitors and resistors and other components, but the selection of the heat sink material is also an important factor affecting the cooling effect. Most commercially available CPU fan with heatsink generally use aluminum production (aluminum due to insufficient hardness, it is difficult for cutting). This is because the aluminum processing, and surface treatment easier (for example, grinding and cutting and other processing), and low cost. "220V Cooling Fan" copper or copper alloy is heat sink selection scheme can be considered another set. But here are a few questions to clarify: First, the thermal conductivity of copper is almost twice as aluminum, but that does not mean copper radiator cooling effect can be achieved double aluminum radiator. Because the effect of the heat sink and the work is not only determined by the thermal properties of the material. Secondly, the better "220V Cooling Fan" cooling performance does not make up for the shortcomings of copper market - higher prices. Again, the higher the density of the material also makes the quality of the copper heat sink is relatively heavy, which means higher static gravity. Finally, there is unsatisfactory hardness of copper and some other "birth defects."