I don't have a Noctua... but... in general, you need to be sure the cooling fins and/or fans do not cause problems with your memory modules
Some memory modules are so tall that you must select a CPU cooler that won't touch the memory
Other than that, any fan on the cooling fin should be aimed at the rear exhaust fan, so the warm air is blown outside the case
Airflow in this picture is from right to left to the exhaust fan at the back.
1. Super important. You must have a big tower cases.
2. Air flow always to the back os the cases in the 3 fans you have on the pic.
3. If you are going to use the 6 ram slot do it before you fix the noctua.
4. Wach out the size of your ram. Some cases you hae to take off the ram desepator like in this pic.
I have a huge case (antec 1200) and Noctua approved ram for fit ... and will install that first. It seems odd that they even suggest an option where the exhaust doesn't go out the back. Just wanted to make sure I wasn't missing something.
Not every case has the exhaust at the rear, some have the exhaust at the top, in which case the cooler must be turned 90 degrees and the airflow from bottom to top.
Just mark your question as replayed.
My case has both top and back exhaust vents ... is one more optimum than the other?