Silent to Power User ReadySilent user can obtain more airflow without sacrificing in noise level and power user can get extra airflow from the static pressure feature. Total 5 different rpm to choose from! (500rpm ~ 1900rpm)More AirflowCompare to a standard 120mm case fan available in the market, Scythe Slip Stream 120mm case fan generates more airflow (Approximately 20~40% more). 4-Pin Peripheral Adopter ProvidedTo be versatile, this case fan comes with the 4-pin peripheral adopter.