HIGH SPEED 2200RPM: 120x120x25 mm 120mm High CFM 12v dc 0.21A 4Pin PWM Mining Rig fans for the replacement of desktop computer pc case fan ,CPU cooler fan or other electronics equipment heat sink water cooling radiator.the fan's speed can be adjusted by using a different voltage (5-12V), it can work at a lower voltage to achieve a silent effect. 4PIN PWM FUNCTION: 4Pin PWM 12 volt cooling fan to be fit for 4pin CPU PWM fan port or water-cooling radiator,motherboard will adjust the fan speed from 800RPM-2200RPM according to inner working temprature automatically. HIGH WIND PRESSURE ENHANCEMENT: 7pcs sickle blade & 2mm side cut space between blade and frame,airflow reverse diversion with strong wind pressure. HYDRAULIC BEARING: 120mm pc fan 3 pack with up to