A combination of fan and heat sink includes a fan (10), a heat sink (20) and four fixtures (30). The fan defines four holes (12) in four corners thereof respectively. The heat sink has a plurality of parallel fins (24). Each fixture includes a post (32) inserted into the corresponding hole of the fan, a pressing portion (36) pressing the fan toward the heat sink and a locking leg (34) interlocking with outmost fins.

 
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