Virtually inaudible operation achieved through a broad array of meticulous optimizations including the use of a be quiet silentwings 3 135mm fan silentwings 3 fan features an advanced fan frame an airflow optimized fan blade fluid dynamic bearing with copper core and a high quality 6 pole motor for less vibration the funnel shaped fan opening of the psu case is significant big and allows high airflow intake 800 watts of continuous power with stable four 12v rail design nvidia sli ready and amd