Intel Reference Cooler With More Copper And Larger Surface
The copper core is quite obviously bigger than before.
All Intel boxed processors come bundled with a suitable cooler. Due to the increased maximum thermal design power of the fast Smithfield models, Intel made some changes to their reference cooler design; they increased both the surface area and the size of the copper core in order to improve heat dissipation.
The old cooler: the fins are split into two branches.
The new guy: there are more fins now and they are thinner.