SlimSAS 8i x2 to PCIe x8 Gen 4 Slot Dual Port Open End Adapter
Samsung's 990 Evo is the world's first hybrid PCIe 4.0 x4 and 5.0 x2 SSD — FrankenSSD has two different interfaces with two different lane widths | Tom's Hardware
M.2 & PCIe Lane Configurations for B550 Unify / Unify-X