x16/x16 (x8 lanes) PCIe riser card
See this section to locate the connectors on the x16/x16 (x8 lanes) PCIe riser card.
Figure 13. x16/x16 (x8 lanes) PCIe riser card connectors
Table 11.  x16/x16 (x8 lanes) PCIe riser card connectors
1  PCIe full-height riser 3  PCI Express 3.0 x16 (x8 lane) (Slot 2)
2  PCI Express 3.0 x16 (x8 lane) (Slot 1)
34 ThinkSystem SR860 V2Setup Guide