AM4 Socket Server CPU Cooler Alternative to Arctic Freezer 4U-M

[homelaber]

I am currently looking to replace my upside-down Noctua desktop CPU cooler with a properly rotated CPU cooler for my server motherboard so that the airflow goes to the back and not the top or bottom. The problem I have is that my server motherboard uses an AM4 socket and most of the good air CPU coolers for servers I have seen so far are only for Threadripper or Epic.

In short, what is the best alternative to the Arctic Freezer 4U-M for an AM4 socket server motherboard (rotated 90 degrees from normal desktop PCs)?

I am maxing out an AMD Ryzen 9 5950X, so high cooling performance is essential. Noise should be low, max size is 4U.

[lemma]

@homelaber

what is the best alternative to the Arctic Freezer 4U-M for an AM4 socket server motherboard

Don’t know of any AM4 data on this but Thermalright’s Phantom Spirit 120 and 120 SE are good candidates. There’s a 90° rotation between AM4 and AM5 and those two Phantom Spirit versions seem to have about the lowest base to fin thermal resistance, noise-normalized, available for either socket.

[ArmrestCaseGlass]

You can get alternative mounting hardware for Noctua coolers to rotate by 90 degrees.