Gateway Tower User Manual page 242

Chapter 13: Upgrading Your Computer
5
Remove the retention thumb-screw that secures the card retention cover
to the case, then swing the add-in card retention cover open.
6
If you are replacing an add-in card, remove the old add-in card. You can
slightly seesaw the card end-to-end to loosen the card, but do not bend
the card sideways.
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