Abstract: A cooling fin is integrally formed and comprises a board body, a passage penetrating the board body, and plural heat dissipating portions located outside the board body in the direction along the passage. Between each two neighboring portions is defined a heat dissipating space. By such arrangements, the cooling fin has the advantages such as better heat dissipation effect, easy to assemble and simple structure without any assembling operations and procedures.

Abstract: A heat sink for a memory comprises two heat-conducting sheets and a fan. Both sides of the memory are clamped by the two heat-conducting sheets, and between the two heat-conducting sheets is defined a convective space. The upper end of the convective space is sealed. The fan is disposed between the two heat-conducting sheets, so that the fan can guide the air into the convective space from exterior to exchange heat with the memory and the two heat-conducting sheets, and then the air will carry away the heat into the environment, so as to achieve the heat dissipating effect.