Cooler Master solutions are still installed onto mainboards the same way as before. Before installing the cooler you have to attach corresponding retention plate(s) to the cooler base using the included screws:
Depending on the socket type you insert (rotating counterclockwise) two or four spindles into the loops of the retention plates and stick special rubber rings to them that will protect the mainboard PCB from damage when the cooler is installed:
After that you remove the plastic film from the cooler base and apply thermal compound to it. Then you place the mainboard on top of the cooler standing upside down, place the corresponding backplate where it should be and tighten the whole thing with screw nuts using the enclosed wrench. Considering how small the cooler actually is, the only “inconvenience” here is removing the board from the system case before Cooler Master GeminII S installation. However, the cooler will be fastened very securely, and the PCB will not bend in any way. As you remember, the first GeminII cooler was initially shipped without any backplates.
The cooler looks very compact inside the system case:
In conclusion I would only like to add that GeminII S is also bundled with two metal railings that allow installing two 120-mm fans on top of its heatsink. However, only one of them will be cooling the heatsink. The other one will cool either memory modules or mainboard chipset heatsink. It is a very interesting solution that gives the users a lot of flexibility in determining the prioroties.
If I missed something about the cooelr installation, you can always check out the step-by-step installation guide for Cooler Master GeminII S available on the official web-site (PDF file, 831KB).