Asus RS120-E4/PA4 - Manual (Page 30)

Chapter 2: Hardware setup 2-14
To install a PCI Express x8 card:
2. Use a Phillips (cross) screwdriver
to remove the screw that secures
the slot metal cover.
4. Install a PCI Express x8 card to
the bracket as shown, then secure
the card with a screw you removed
earlier.
1. Follow steps 1 to 2 of the previous
section.
PCI Express x8 slot
3. Remove the slot metal cover, then
set it aside.