Lenovo ThinkSystem SR650 V2 Maintenance Manual page 86

Riser card 3 (x8/x8 PCIe) cable connection
Figure 19. Cable routing for x8/x8 PCIe riser card 3
From
MCIO 1 on the riser card
1
MCIO 2 on the riser card
2
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To
PCIe connector 2 on the system board
PCIe connector 5 on the system board