Riser card 3 power and sideband connection (Gen 4/Gen 5)The power and sideband connections for x8/x8 PCIe riser card 3 and x16/x16 PCIe riser card 3 are the same.Figure 281. Riser card 3 power and sideband connectionFrom To1 Power connector on the riser card 1 Riser 3 power connector on the system boardassembly2 Sideband connector on the riser card 2 Riser 3 sideband connector on the system boardassemblyChapter 6. Internal cable routing 301