The Fan1156PWM CPU dyspher with PWM cooling fan for LGA1156/1155 Socket systems offers reliable and efficient cooling for Intel® Core ™ i3/i5/i7 CPU compatible. Thanks to PWM technology (Pulse Width Modulation) The fan speed can be dynamicly controlled by the motherboard so that the venture Functions at a speed suitable for operating conditions, reducing the current consumption and fan noise while the system is inactive and ensuring maximum cooling in full load conditions. With 2 -year Startech.com guarantee and free -life technical support.