The FAN1156PWM CPU Cooler with PWM Cooling Fan for Socket LGA1156/1155 systems provides reliable and efficient cooling for compatible Intel Core i3/i5/i7 CPUs. 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 conditions. Backed by a StarTech.com 2-year warranty and free lifetime technical support. PWM control allows for dynamically variable fan speeds for maximum efficiency. 95mm Ever Lubricate bearing fan for increased reliability and lifespan compared to traditional sleeve-bearing designs. Backed by a StarTech.com 2-year warranty and free lifetime technical support. Computer systems where the cooling fan does not need to run at full speed all the time, for lower power consumption and noise. Replace a noisy or failed CPU cooler for an LGA1156/1155 system.