High performance ultra quiet pwm case fans the arctic f pro pwm fans outerperform other 80mm92mm120mm fans in the market the patented pwm sharing technology pst regulates the speed up to 5 fans via bios with efficient central cooling the arctic f pro pwm fans offer excellent cooling and noise control performance for the system patented pwm sharing technology pst best noise performance ratio patented fan holder eliminates the buzzing sounds patented vibration absorption fluid dynamic bearing