The fan8025pwm 80mm pwm case fan adds an efficient air cooling solution to computer cases or other enclosures to keep components running optimallyr r with pulse width modulation pwm technology the fan speed can be dynamically controlled by the motherboard so the fan runs at a speed that suits the operating conditions lowering power consumption and fan noise when the system is idle and delivering maximum cooling under full load conditionsr r backed by a startechcom 2 year warranty and