Silverstone Tek 92mm Ultra-Quiet PWM Fan with Anti-Vibration Rubber Pads Cooling FQ91 PWM design allows 1000~2500rpm fan speed control by motherboard Innovative blade design focuses airflow with maximum efficiency Optimum airflow, pressure and extremely silent performance Air-inlet with optimized aerodynamic design reduces noisy air turbulence Anti-vibration rubber pads included for additional noise dampening