Abstract: A heat dissipating device (10) includes a hollow post (20) defining a plurality of grooves (28) in a longitudinal direction thereof, a base (22) extending from the post and located at one end of said longitudinal direction, a plurality of fins (30) radially extending from the post. Each fin has a heat absorbing portion extending through a corresponding groove of the post and a heat dissipating portion opposing the heat absorbing portion. A combining member (40) is filled in the post and integrated with the heat absorbing portions of the fins and the base.

Abstract: A fastener (50) includes a pin (52), a spring (54) and a handle (56). The pin extends through a heat sink (10). The handle is pivotably attached to a top portion of the pin. The pin has a foot (522) extending through a mother board (30) and a supporting board (40) located under the mother board to engage with the supporting board. A CPU (20) is mounted on the mother board. The spring surrounds the pin and is located between a base of the heat sink and the handle. When the handle is rotated from a horizontal position to a vertical position, the handle compresses the spring toward the foot. The spring in turn presses the base of the heat sink against the CPU.