In this study, simulations are made to resolve a 100 W heat dissipating capacity of a portable PC in (with a CPU IHS size of 31 mm × 31 mm). The problem is investigated via a commercially available software (Icepak version 4.1). The present design incorporates heat pipe to convey heat from the hot spot towards the heat sinks. The heat sinks are optimized subject to heat loads and their locations. The calculated results of a double heat sinks design show a 30°C less temperature when compared to a single heat sink module. This is because double heat sinks design provides much more uniform temperature and eliminates the edge effect. Moreover, the effect of fin pitches is also examined in this study. It is found that the best performance is at a fin thickness of 0.2 mm and at a fin pitch of 2.4 mm. Depending on the optimal parameters of the thermal module, the chip temperature can be reduced to approximately 75°C.