Why is the area of ​​the radiator exactly adjusted to the area of ​​the cooled element (connection side)?

Question

Server equipment

Why is the connection side area of ​​the heatsink exactly matched to the connection side area of ​​the cooled element?

Answer 1

KO suggests that a small area will not be enough for heat removal, and a larger one will give the same performance as an equal one, but at the same time, a larger one will be redundant in terms of manufacturing.

Answer 2

If you are talking about grinding the thermal interface, then the answer is obvious - the fit is better, the thermal diffusivity is higher.