A heat dissipating assembly for dissipating heat from a CPU and a VRM simultaneously includes a base (10) contacting the CPU, a heat sink (20) mounted on the base, a pair of fans (30) attached on a front side of the heat sink, and a fan duct (40) secured to the fans. The fan duct has a first inlet (440) through which a part of airflow flows into the fan duct, a second inlet (460) through which another part of the airflow flowing into the fan duct. The another part of the airflow also flows through the VRM so it can cool the VRM. The fan duct further has an outlet (480) for allowing the airflow generated by the fans to blow to the heat sink.