Correct, because a rack is silent! What and how you mount in the rack matters. Here is my AIO cooled threadipper in a 4U enclosure https://imgur.io/a/LlZy6px

Correct, because a rack is silent! What and how you mount in the rack matters. Here is my AIO cooled threadipper in a 4U enclosure https://imgur.io/a/LlZy6px https://imgur.io/a/LlZy6px