Power and sideband cable connection
The following illustration shows the power and sideband connections for x8/x8 PCIe riser card 3 and x8/x8 
PCIe riser card 4.
Figure 288. Riser card 3/4 power and sideband cable routing
From To
1  Power connector on the riser cards 1  Riser 3 power connector on the system board 
assembly
2  Sideband connector on the riser cards
2  Riser 3 sideband connector on the system board 
assembly
Signal cable connection
The following illustration shows the signal connections for x8/x8 PCIe riser card 3 and x8/x8 PCIe riser card 
4.
Chapter 6. Internal cable routing 307