HP dx7500 - Microtower PC Service & Reference Manual page 132

b. If you are removing a PCI Express x1 card, hold the card at each end and carefully rock it
back and forth until the connectors pull free from the socket. Be sure not to scrape the card
against the other components.
Figure 8-36
c. If you are removing a PCI Express x16 card, pull the retention arm on the back of the expansion
socket away from the card and carefully rock the card back and forth until the connectors pull
free from the socket. Be sure not to scrape the card against the other components.
Figure 8-37
6. Store the removed card in anti-static packaging.
122 Chapter 8 Removal and Replacement Procedures Small Form Factor (SFF) Chassis
Removing a PCI Express x1 Expansion Card
Removing a PCI Express x16 Expansion Card