Scythe Slip Stream 120 PWM SY1225SL12LM-P Fan The Slip Stream PWM 120 mm fan can work by using a PWM enabled motherboards,which are automatically controlled The fan speed range begins by 0 (+200rpm) goes up to 1,300 rpm (10%) while an air flow of up to 74,25 CFM = 126 m/h is produced. 4-Pin Peripheral Adapter Provided To be versatile, this case fan comes with the 4-pin peripheral adapter.