Riser card 3 (x16/x16 PCIe) cable connection for configuration with 32 NVMe drives
The following illustration shows the cable routing for the x16/x16 PCIe riser card 3 when the server is 
configured with 32 NVMe drives.
Figure 22. Cable routing for x16/x16 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 and MCIO 3 on the riser card PCIe connectors 5 and 6 respectively on the system 
board
3  MCIO 4 on the riser card PCIe connectors 1 on the system board
Chapter 3. Internal cable routing 79