CPU Thermal Design Power 250W
Here is what a reviewer wrote about Noctua nh-u9:
Pros: Quiet, Easy to install if it fits.
Cons: Does not adequately cool a Threadripper 2 model 2950.
I decided to try the NH-U14S with a second fan. I only did so after I CAREFULLY COMPARED its dimensions and those of the motherboard. Amazingly, it fits better because it is narrower and higher. Equally importantly, the new cooler works better, with idle CPU temps below 40 deg and operational temperatures no higher than the mid 50s.
From Newegg review of cooler