Asus RS161-E4/PA2 - Manual (Page 30)

Chapter 2: Hardware setup 2-14
2.6 Expansion slot
2.6.1 Installing an expansion card to the riser card bracket
The barebone server comes with a riser card bracket. You need to remove
the bracket if you want to install PCI Express x16 expansion cards.
To install the PCI Express x16 expansion cards:
1. Firmly hold the riser card bracket,
then pull it up to detach it from
the PCI Express x16 slot on the
motherboard.
2. Place the riser card bracket on
a flat and stable surface, then
remove the screw from the slot
bay.
3. Use a Phillips (cross) screw
driver to remove the screw that
secures the slot metal cover.
4. Remove the slot metal cover,
then set it aside.