the first and second fins are perforated with through holes 142 182 each of the through holes 142 182 has its respective annular sidewall 144 184 that is formed during punching of its respective through hole 142 182 the condensing portions 162 of the heat pipes 16 are received in the through holes 142 182 and soldered to the sidewalls 144 184 so that the first fin assembly 14 and the second fin assembly 18 are combined with the condensing portions 162 of the heat pipe 16 the first and second fin assemblies 14 18 are both mounted on the evaporating portions 160 of the heat pipes 16 the first fin assembly 14 has a top fin 146 and a bottom fin 147 the top and bottom fins 146 147 cooperatively function as a fan holder for mounting the fan 20 on a side of the first fin assembly 14 in addition to their original function of heat dissipation in this preferred embodiment of the present invention the fan 20 is sandwiched between the first fin assembly 14 and the second fin assembly 18 the top fin 146 and the bottom fin 147 have the same configuration and are mounted on top and bottom of the first fin assembly 14.