A heat dissipation apparatus (10) includes a computer enclosure (110) made of thermally conductive material, a fin assembly (140) secured to the computer enclosure, and a heat pipe (130) having an evaporating section (131) thermally connecting with a heat generating electronic component and a condensing section (132) thermally connecting with the fin assembly. The fin assembly has a bottom surface contacting with a chassis of the enclosure to thereby transfer heat from the fin assembly to the chassis for dissipation. The enclosure forms a pair of clamping members (111) clamping the fin assembly therebetween.