Dell XPS 8500 Owner's Manual page 45

3 Locate the PCI-Express x1 card on the system board.
See "System-Board Components" on page 21.
4 Disconnect any cables connected to the card, if applicable.
5 Grasp the card by its top corners, and ease it out of its connector.
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PCI-Express x1 card slot PCI-Express x1 card
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PCI-Express x1 Card(s)