The included SecuFirm2 mounting system for AMD's AM2, AM2+, AM3, AM3+, FM1 sockets require the use of the original backplate for the retention bracket normally included with the motherboard. The Noctua mounting system screws into the backplate, then the heatsink is screwed onto the mounting system.
The included SecuFirm2 Intel mounting bracket is compatible with LGA1366, LGA1156, LGA1155, LGA775 sockets. The system uses the heatsink mounting holes around the CPU socket. Depending on which socket you have, there are three different screw positions in the bracket system. Available on request from Noctua is an LGA2011 mounting bracket.
Also included with the NH-D14:
Using the Intel SecuFirm2 mounting bracket set with LGA1155 spaced mounting holes on our ASRock Z68 Extreme3 motherboard, there were no clearance issues around the socket. Clearance wise, the Intel SecuFirm2 mounting bracket doesn't exceed the perimeter of space used by the stock Intel cooler.
Despite covering the memory slots on the motherboard, the fins on the NH-D14 are high enough so as the slots are still usable. Unlike other coolers, the NH-D14 will allow for the use of some DDR3 modules with exotic cooling. Modules under 1.9 inches in height should fit.
The large 140mm fan overlaps the bottom and top edges of the heatsink. This overlap helps to create airflow under the heatsink, which at this size would otherwise become a bit of an airflow dead zone. This is good for the health of the surface mounted motherboard components, and for the installed memory.
It's easy to see that the NH-D14 will cover up a lot of the area surrounding your motherboard's socket. Regardless of the size of the cooler, there were no clearance issues at all. No connectors or sockets were completely blocked by the cooler.