"Micro Cooling Fan" main role is the heat, and the heat sink is required by forced convection fan to speed up heat dissipation, so a fan of good or bad, on the whole cooling effect plays a decisive role. Equipped with an excellent performance of the CPU fan is one of the key factors to ensure the smooth functioning of the entire computer. Fan speed is the number of "Micro Cooling Fan" fan rotations per minute, the unit is rpm. Fan speed is determined by the motor inside the coil turns, voltage, number of fan blades, inclination, height, diameter and bearing systems. Fan speed and quality are not necessarily linked. "Micro Cooling Fan" speed can be carried out by the internal speed signal measurement can also be measured by external (external measurement is to see how fast the fan speed with the other instruments, internal measurements directly into the BIOS can see, you can also software to see internal measurement error is relatively larger).