Thermalright didn’t spend a whole lot of time tweaking the Ultra-120 design; in order to increase the amount of heat the heatsink can effectively remove they added 2 heat pipes, this makes the base of the heatsink quite cramped as you will see in the photos, it’s basically a collection of heat pipes.
The fin design and fan mounting clips remain the same; the dimensions of the eXtreme are the same as the original. So from most angles the two heatsinks are identical.
The Ultra-120 eXtreme takes advantage of the 120mm fan size but it not very deep, as you can see in the photo below, approximately the depth of 2x120mm fans.
In the photo above you can already see the large collection of heat pipes at the base, the next one shows it more clearly:
The base is flat with small traces of machine lapping.
Time for installation ->