A securing means is adapted to attach a heat sink (70) to a CPU on a circuit board (80). The securing means comprises a retention module (10) and a cover clip (30). The retention module has two front and two rear columns (14', 14) cooperatively defining a space therebetween for accommodating the heat sink. The cover clip has a pair of pivots (36) rotatably engaged with the rear columns, and locking means adapted to engage with the front columns. The cover clip is adapted to resiliently abut a top of the heat sink.