Riser card 3 (x8/x8 PCIe) cable connection for configuration with 32 NVMe drives
The following illustration shows the cable routing for the x8/x8 PCIe riser card 3 when the server is 
configured with 32 NVMe drives.
Figure 20. Cable routing for x8/x8 PCIe riser card 3 (configuration with 32 NVMe drives)
From To
1  MCIO 1 on the riser card PCIe connector 2 on the system board
2  MCIO 2 on the riser card PCIe connector 5 on the system board
Chapter 3. Internal cable routing 77