Dell EMC PowerEdge R620 Owner's Manual page 60

Figure 29. Removing and installing the expansion card riser 1
1 expansion-card riser 1
3 riser guide back (right)
5 connector
Figure 30. Removing and installing the expansion card riser 3
1 connector
4 If applicable, remove or install an expansion card on the riser.
60 Installing and removing system components
2 expansion card
4 riser guide back (left)
2 expansion card riser 3