Installation and Finished Product
Since the back plate uses a riser and raised nut system, once you pass the studs through the motherboard, the board will bottom out against risers. This keeps the back plate from touching and eliminates the need for a plastic or foam spacer.
As the instructions say, I found the two cut-outs in the base and made sure to install that closest to my video card. Being completely square I don't see the reasoning, but I did as instructed anyways.
Mounting the PH-TC90LS is as simple as adding the four screws, and securing them to the back plate. Right about the time you run out of room to fully compress the spring, the threads run out stopping you when it is mounted correctly.
With the compact design of this cooler, it easily leaves all four memory slots open, and in no way will have issues with even the tallest of RAM heat spreaders.
Just to give you a bit more perspective on exactly how tall this cooler is once mounted to the board, I got as low as I could to show what can actually be seen over the memory. Anything taller here and the cooler virtually disappears.
Form this angle you can see that there is little to no reason this won't fit on any motherboard with any configuration, as long as you have the correct socket. It does take up all the room it can, but it misses all of the heat sinks, leaves the memory slots open, and doesn't even come close to the video card.