Heat Transfer in Fins- Help needed

I am trying to simulate a heat sink, very similar to the one shown in the tutorials... In spite of building a coarse mesh, the solution does'nt converge even after 2 hours of solving. I have an i5 processor and a 4 gb ram. I would like to know which solver and which configuration are best to solve my steady state heat transfer problem.

Thanking you,
N.Sathyanarayanan