Thermaltake ISGC-100 Heatpipe CPU Cooler with 4pin PWM Fan - CLP0537 ISGC Fan Technology; Slim 92mm PWM fan specially designed to reduce air turbulence and friction; providing a comfortable and silent operation environment Hydro Dynamic Bearing (HDB) Technology: Improved fan operation stability and noise production for extended overall product durability The Perfect Copper+ Base Architecture x 3 Heatpipes. Unique combination of copper and aluminum mixed base with 3 heatpipes for both advanced cooling performance and ultra light weight of only 335g Individual Sawtooth Fin Design : Achieving optimized cooling performance and minimal noise production with the exclusive saw-toothed design on the fins to enhance the air ventilation within the cooler