For my own builds, I use nothing but Noctua coolers and fans. They are a great company to deal with and respond to any inquiry in a timely manner.
That being said, I can only imagine the noise coming out of tiny fans like these would be close to a rack-mounted server's (tinier fans seem to run at higher speed more often = noisy), but they'd be quieter than anyone else's out there where the application requires a cooler on the smaller side.
While the performance and cooling are excellent as has become a Noctua standard, good lord that color combination leaves much to be desired. I know that some of their stuff is available in black (thank goodness), but I'll never understand why they chose the main color combination.
I also dislike test on 8 cores. This makes no sense. Threadripper is 16 core period. Thats also confirmed by AMD to be most sold. Although noctua is a good brand. I fail to see the viability of using this or any Air Cooling solution on a 16 core processor. Can it be done? Yes. Should it be done? IMHO no. If you don't want peak performance you probably also don't need threadripper.