I think you mistook this thread for S4M. S4M-C has minimum (edit: maximum) cooler of 40mm not 45 mm like S4M.
I did make a mistake here and its 1000% MY FAULT and I need to clarify.
The S4M and S4M-C have exactly the same internal thickness and exactly the same standoff height, so cooler compatibility is exactly the same.
I did, however, change the language/wording on the max cooler height. With the S4M-C I put a limit on it because coolers need an air gap to work properly, and the NH-l9i at 37mm worked flawlessly with my testing. So I capped it at 40mm.
With the S4M I changed it to 45mm, because I spent too much time answering questions about why the RAM height and cooler height maximums were different.
The TL;DR is that if a cooler combo works in the S4M-C it is going to work in the S4M and visa versa.
I'm sorry for the confusion and I am grateful to everyone here in this thread working so hard to help out people and answer their questions despite my confusing info.
Peace to you guys and gals and thanks!
-Josh