Acer Altos R720 Series - Manual (Page 77)

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To install the PCI riser assembly:
1 Observe the ESD precautions and pre-installation instructions
described on page 35.
2 Lower the PCI riser assembly (A), aligning the three hooks on the
back edge of the riser assembly with the matching slots on the rear
of the chassis (B).
3 Press down on the assembly until the three hooks on the rear of
the riser assembly engage the chassis back panel slots.
4 Connect the cables to the installed PCI card.
5 Observe the post-installation instructions described on page 36.
Removing and installing the PCI riser board
The PCI riser assembly has two PCI riser boards that supports five PCI
cards.
• Low profile riser board- two PCI Express x8 slots (with x4
throughput)
• Full height riser board- two PCI Express x8 slots (with x4
throughput) and one PCI-X 133 MHz slot
PCI riser boards can be replaced if it fails or if you require a different
option.