Asus BP5120 - Manual (Page 32)

2-10 Chapter 2: Basic installation
3. Align the card connector with the
slot and press firmly until the card
is completely seated on the slot.
Replace the metal bracket lock.
4. Replace the metal bracket lock
screw to secure the card.
This system only supports low profile PCI, PCI Express x1, and PCI Express
x16 cards. You can only install low profile expansion cards on this system.