Installation and Finished Product
The back plate has been installed; the black spacers dropped on the studs, we added in the brackets to secure the NH-D15, and tightened it all in place with the thumbscrews to make it solid to the motherboard.
Behind the motherboard we have the main components of the SecuFirm mounting hardware, the Intel back plate. We have it oriented to allow the socket screws to poke through, and it is isolated from the motherboard with a plastic sheet on the flip side and washers at the studs.
For testing purposes, we had absolutely no issues with the installation or removal of the GSkill Trident X we use for testing. It is easy to see that even taller heat spreaders will have room, and for ones like these, there is plenty of room for removal without needing to pull the cooler.
Looking at things much closer, we can see that even the closest slot won't be interfered with by the cooler, and this is true for both sides, so that LGA2011 users reap the same benefits.
When we went to reinstall the front fan to the cooler we now plainly see the issue we eluded to earlier, and that is that the fan has to sit much higher than most cases will allow for. Even with the tops of ours removed; the fan still is left sitting 20mm taller than the tips of the pipes, making the NH-D15 now stand 185mm in height.
Our point is only exaggerated from this angle as it is easier to see just how much higher the fan at the front sits than the one in the middle does. Of course, we could just try the back of the cooler too for the second fan, but sure to the shield on our motherboard, we couldn't lower the height much there either.
This last image is just to give normal chassis users an idea of what the Noctua NH-D15 might look like through the window of your chassis. Inside of a normal chassis, the cooler will overtake the majority of the top half of the motherboard. Planning out the wiring before mounting the cooler is also a good idea.