No compromise silence and performance be quiet silentwingsreg 3 140mm pwm stands for state of the art technology virtually inaudible operation and superior cooling it meets all the requirements to be a perfect choice for heat sinks pc cases and radiators virtually inaudible operation at max 155dba 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 rubberized fan frame with