I purchased a used Gigabyte AORUS B550M PRO and a new 2TB WD_BLACK SN850X NVMe M.2 (CPU: Ryzen 7 5700x).
The 1TB and 4TB SN850X are listed in the list of supported NVMes by Gigabyte (https://download.gigabyte.com/FileList/Document/mb_m.2_support_230414_n.pdf?v=5e4dc0ada71e447a48b292a1a947e373)...