HP ProLiant DL180se G6 Maintenance And Service Manual page 82

To remove the PCIe riser card:
Loosen the screw securing the riser card to the PCI cage.
1.
Push the riser card back and then lift it out of the PCI cage.
2.
Figure 50 Removing the Two PCIe x8 Riser Card
Loosen the screws securing the riser card to the PCI cage.
1.
Remove the riser card from the PCI cage.
2.
Figure 51 Removing the PCIe x16 Riser Card
Removal and replacement procedures 82