I'm not sure, but you could always just buy the Minisforum BD790i X3D [1]. Then, you'd be able to choose your own fan and case, and you can make it arbitrarily quiet by selecting a good fan. Early BD790i boards had a bug where losing power causes it to reset all BIOS settings, but they fixed that in later batches. I wonder when they will come out with a 9955HX version. Another good thing about this board is that it has two PCIe 5 NVME SSD slots with active cooling, which is a lot better than most other mini ITX boards out there, including the Framework.
[1] https://store.minisforum.com/products/minisforum-bd790i-x3d
I did exactly this, put it in a 2U case. Fantastic performance, but even with the best Noctua I could put on it the CPU fan sounds like a Hawker Harrier doing VTOL when it's under load. Don't regret the board, but wish my rack was in another room now.