Abstract: A heat dissipation device comprises a first heat sink (10) for thermally contacting with an electronic device, a second heat sink (20) mounted on the first heat sink, heat pipes (40) connecting with both the first and second heat sinks. The heat pipes surround an entire periphery of the first heat sink and a part of the second heat sink. Each heat pipe comprises an evaporating portion (42), a first condensing portion (46) and a second condensing portion (44). The first and second condensing portions extend from two opposite ends of the evaporating portion respectively. The evaporating portion is positioned adjacent to the electronic device and the two condensing portions extend inwardly and bend in opposite directions to each other. The first condensing portion extends through the first heat sink and the second condensing portion extends through the second heat sink.

Abstract: A clip assembly (30) for mounting a heat sink (20) on a printed circuit board (10) includes a closed annular positioning portion (32) interferingly engaging with the heat sink, a securing portion (34) secured to the positioning portion. The securing portion has a pressing member (340) extending through an opening (320) defined in the positioning portion for resiliently abutting against the heat sink, and two arms (344) extending from free ends of the pressing member with a pair of hooks (342) formed at distal portions of the two arms for engaging with the printed circuit board.