Featuring pwm function the arctic f pwm fans run at the most necessary speed to deliver maximum cooling capacity at the lowest noise level possible on top of that thanks to the patented innovative pwm sharing technology pst up to 5 fans including cpu fans can be connected to the arctic f pwm fan to share the pwm signal the speed of all the fans in this pst system is now centrally controlled by a single pwm signal via biosas a result when the system load increases fan speed of all fan