With a good performance of the CPU fan is one of the key factors to ensure the smooth functioning of the entire computer. 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. 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).