Asus Motherboard PR-DLSR533 - Manual (Page 36)

2-10 Chapter 2: Hardware information
2.6 Expansion slots
This motherboard has a proprietary expansion slot that accommodates a
dual slot riser card. The riser card implements the PCI-X (Peripheral
Component Interconnect Extended) bus technology to support up to 133MHz
data transfers, or about 1.06GB/s. This bus technology is primarily designed
for servers to increase the performance of high bandwidth devices such as
Gigabit Ethernet cards and Ultra3 SCSI interfaces. PCI-X is backward
compatible with the earlier PCI bus technology making it possible to install
PCI and PCI-X cards at the same time, but the bus speed will be that of the
slowest card.
Installing a card into one of the slots allows for 133MHz bus speed.
Installing two cards reduces the bus speeds to 100MHz for both cards.
2.6.1 Installing an expansion card
Follow these steps to install an expansion card.
1. Before installing the expansion card, read the documentation that
came with it and make the necessary hardware settings for the card.
2. Remove system cover and detach the riser card module from the
expansion slot.
3. Install the expansion card into one of the PCI-X slots on the riser card.
4. Re-install the riser card into the system.
5. Replace the system cover.
Make sure to unplug the power cord before adding or removing
expansion cards. Failure to do so may cause you physical injury and
damage motherboard components.
Refer to the AP1600R system user guide for details on expansion card
installation.