Thermal problems can be solved by a cheapest, simple and best means by using heatsinks. Where there is a need to dissipate the heat from a hot body to another medium, heatsinks are used. The heatsink application is widely spread across many domains. In this paper, we would like to understand the thermal benefits of using a porous pin fin heatsink when compared to a conventional pin fin heatsink. The cross section of the heatsink used in the analysis is square shaped. The Heatsink is to be analyzed numerically for natural convection assuming steady state condition. Finite volume method is considered for doing the thermal analysis using a Computational Fluid Dynamics tool called FloTHERM.