MINISFORUM has revealed how its B550 mini-PC will work with full-sized GPUs. However, the company now states that the machine will only support up to 65 W processors, taking the Ryzen 7 5800X and Ryzen 9 5900X off the table.
https://www.notebookcheck.net/MINISFORUM-scales-back-its-ambitions-for-its-B550-mini-PC-as-it-reveals-its-open-air-graphics-card-dock.598840.0.html