Asus RS100-E6/PI2 - Manual (Page 34)

Chapter 2: Hardware setup 2-16
4. Install the expansion card to the
riser card as shown.
5. Attach the expansion card to the
expansion card bracket, and then
secure the card with a screw.
6. Align the riser card with the
expansion card installed to the PCI
Express slot on the motherboard.
7. Press the riser card until the golden
connectors completely fit the slot
and the bracket aligns with the rear
panel.
8. Secure the expansion card bracket
to the system with one screw.