Figure 79. Installing the PCIe riser assembly to zone 1
Step 2.  If you are installing x16/x16/x16 riser assembly, connect the two PCIe cables to the system board. 
Figure 80. Connecting PCIe cables from x16/x16/x16 riser to the system board
1  PCIe connector 1 2  PCIe connector 2
Install the PCIe riser assembly to zone 2
Watch the procedure. A video of this procedure is available from the following links: 
• 
https://www.youtube.com/playlist?list=PLYV5R7hVcs-C6QgmsUMRG6ul0bHzrGmsG
166 ThinkSystem SR850 V2 Maintenance Manual