Air-cooled radiator, the final go through "Waterproof Cooling Fan" to speed up the forced convection heat distribution, so a fan is good or bad, the cooling effect on the whole played a decisive role. With a good performance of the CPU fan is one of the key factors to ensure the smooth functioning of the entire computer. Determinants of many fans the ultimate thermal performance, including wind, speed, noise, length of life, what kind of fan bearings. Air volume air volume means the fan cooled radiator exhaust air per minute or included total volume, if calculated according to cubic feet, the unit is CFM; if you press m to count, that is CMM. Radiator air volume units often use the CFM (about 0.028 m3/min). 50x50x10mm CPU fan will generally reach 10 CFM, 60x60x25mm fan usually reach 20-30 CFM. In the same heat sink material, the air flow is a measure of air-cooled heat sink cooling capacity of the most important indicators. Obviously, the larger the amount of wind its radiator cooling capacity is also higher. This is because the heat capacity of the air ratio is constant, the greater the amount of wind, that is, more air per unit of time can take away more heat. Of course, the same amount of wind cooling effect of wind flow situation the way.