C612i s equipped with four 6mm heatpipes with Direct Contact Technology effectively provide excellent heat dissipation.PWM Silent Fan  Automatically controls the fan speed according to the temperature of CPU. They work efficiently and decreases fan noise. The Ant Esports ICE-C612 with Rainbow LED PWM Fan to give you an absolute visual treat.Optimized Fin Design promotes with Tunnel Effect layout creates micro vortices that boost the airow and circulate it around the heatpipes.