Acer Altos R720 Series - Manual (Page 81)

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5 When removing a full height PCI riser board, open the full length
PCI card retention clip on the front of the riser assembly by
rotating it 90 degrees outward (B).
6 Remove the filler panel (C), if installed.
7 Insert the PCI card into the selected slot (D). Make sure the card is
properly seated.
8 Close both retention clips.
9 Observe the post-installation instructions described on page 36.