Long service life the fluid dynamic bearing comes with an oil capsule that avoids lubricant leakage thus this bearing is as quiet as a sleeve bearing but comes with a significantly higher service life perfect case fan regulation with pwm the pwm function allows the motherboard to run the fan precisely at its necessary speed this guarantees the required cooling and minimizes the noise level fan controller made in germany the arctic f14 pwm fan is well known for high airflow at a comfortable noise