I’m running a 9800X3D on air in my server rack. I’m using a 3U chassis and cooler clearance became an issue, so I went with a low-height Noctua NH-12L.

Even using liquid metal thermal compound, under load I was pushing some unconfortable temps. I read that people had great results undervolting at factory clocks, so I gave it a shot. Now I never exceed 59°C stable.