Dell PowerEdge C6220 II Hardware Owner's Manual page 225

3 Remove the screws that secure the expansion-card bracket. See Figure
3-53 for 1U node. See Figure 3-19 for 2U node.
4 Lift the expansion-card bracket out of the system-board assembly. See
Figure 3-53 for 1U node. See Figure 3-19 for 2U node.
Figure 3-53. Removing and Installing the Expansion-Card Bracket
1 screw (3)
3 system-board assembly
2 expansion-card bracket
Installing System Components | 225