Heat sink assembly

A heat sink assembly adapted to be attached to a CPU, comprising:

• a heat sink comprising a base, a plurality of radially arranged fins extending upwardly from a top face of the base, external splining located below the base and comprising a plurality of external teeth, and a groove defined in a periphery of the heat sink between the base and the external splining;
• and
• a fixing device having a frame and a plurality of resilient arms depending from the frame adapted to engage with a socket, the frame having internal splining comprising a plurality of internal teeth receivable in the groove of the heat sink and horizontally rotatable a predetermined angle to make the internal teeth of the internal splining align with the external teeth of the external splining such that the frame presses the heat sink onto a CPU, the fixing device further having a stop tab engaging with the heat sink to prevent the fixing device from rotating beyond the predetermined angle.

A heat sink assembly comprising:

• a heat sink comprising a base, an engaging body and a groove defined in a periphery of a topmost portion of the engaging body, wherein the base comprises a plurality of fins generally covering the base and extending upwardly therefrom;
• and
• a fixing device received in the groove and attaching the heat sink to an electronic device, the fixing device comprising a frame defining an engaging opening complementarily receiving the engaging body, a stop tab having a latch fixedly engaging with the heat sink, and at least a pair of resilient arms depending from opposite sides of the frame.