HP ML570 - ProLiant - G2 Setup And Installation Manual page 83

Installing Hardware Options
7. Align the expansion board with the groove on the PCI retaining clip opposite the
removed expansion slot cover (for full-length expansion boards only).
NOTE: The PCI retaining clip can be locked in the open position to facilitate expansion
board removal.
Figure 3-35: Locking the PCI retaining clip open
3-42 HP ProLiant ML570 Generation 2 Server Setup and Installation Guide