Compared with the traditional "Micro Cooling Fan", centrifugal fan greater amount of wind energy output in a smaller footprint, the enhance the cooling effect. But centrifugal fan blades machining accuracy requirements are higher than the average fan, the noise emitted by the impeller fouling or high-speed operation is greater. Now with the CPU power consumption drops, CPU turbo fan gradually a large diameter low speed fan replaced by common axial silent, but in the high-performance graphics cards, especially the public version of the radiator is still often used. "Micro Cooling Fan" is driven by the motor rotating impeller, the impeller blades rotate forcing gas, gas acting to increase momentum, the gas under the action of centrifugal force, the impeller thrown around by the scroll type casing converts the kinetic energy into pressure energy, when the impeller is discharged after the gas pressure is lower than the impeller inlet pipe pressure, the new gas at a pressure difference suction impeller, gas is continuously discharged from the "Micro Cooling Fan".