Dell PowerEdge R810 Owner's Manual page 192

Figure 6-5. PCIe Expansion-Card Riser 2 Components
1 slot 5 PCIe - x8 link expansion slot
(24.13 cm [9.5"] length)
3 chassis intrusion switch
192
Jumpers and Connectors
3
2 slot 6 PCIe - x8 link expansion slot
(24.13 cm [9.5"] length)
1
2