Just make sure the "Micro Cooling Fan" of physical size, structure, various properties on all determined by the speed. Speed can affect wind speed, wind, air pressure, noise, power, and even life. The higher the speed, the stronger the fan performance, that the faster the wind speed, the greater the amount of wind, the greater the pressure; at the same time, "Micro Cooling Fan" high speed, friction, vibration, the more noise is large, lifetime bearings and other wear and tear on equipment short; speed is increased, the electrical power consumption increase is the inevitable result. Even if the product does not indicate fan wind, air pressure, it will indicate the rated speed; some of the various "Micro Cooling Fan" is more familiar with the players according to a fan of sizes, shapes, and fan speed is judged on its performance .