Since the "Small Cooling Fan" is to expand the surface area of the heatsink CPU, then how to maximize the surface area, that is, after the material has been decided to focus on the most important design. Common heat sink is die cast into a common shape is more than a few blades "leek" shaped, such heat dissipation fins is the most common. More upscale "Small Cooling Fan" heat sink through the use of aluminum mold made lathe, shape showed a plurality of teeth after turning cylinder. In the case of the same volume, if "Small Cooling Fan" heat sink has more number of fins or toothed cylinder, its surface area is certainly greater. Some production was more extreme heat sink, or even on a metal substrate densely arranged thin fin design, in order to maximize the surface area to expand.