Dell XPS 8500 (Early 2012) - Manual (Page 46)

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Replacing the PCI-Express x1 Card(s)
Place the PCI-Express x1 card in the slot on the system board and press
down firmly. Ensure that the PCI-Express x1 card is fully seated in the slot.
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1 PCI-Express x1 card slot 2 PCI-Express x1 card
2 Replace the card-retention bracket, ensuring that:
• The guide clamp is aligned with the guide notch.
• The top of all cards and filler brackets are flush with the alignment bar.
• The notch on top of the card or filler bracket fits around the
alignment guide.
3 Replace the screw that secures the card-retention bracket.
PCI-Express x1 Card(s) 46