MCIO PCIe gen5 Device Adapter x8/x16two MCIO 8i inputs one PCIe x16 electrical mechanical output PCIe gen5 high quality Amphenol SMT slot, 85Ohm PCB, optimal traces the vertical model can be placed with single width spacing can work in x8 mode with one cable (input near the power plug) can work in x16 mode with both inputs connected (must be the same CPU host port and lane ordering must be 0 7 >8 15, NOT 8 15 >0 7, switching the cables will help!) mandatory Power connector to supply 12V