No compromise silence and performance be quiet silentwingsreg 3 140mm pwm high speed stands for state of the art technology and virtually inaudible operation the extremely high air pressure produced makes it a perfect choice for powerful water and air cooled systems great performance to noise ratio with 281dba at 1600rpm 6 pole fan motor with three phases giving very low power consumption and less vibration advanced fluid dynamic bearing enables super long life span up to 300000h r