3. Secure the bracket with two screws 3.
Figure 4-22 Installing the PCI retainer
PCI Express
PCI Express is a point-to-point architecture and uses a serial data transmission protocol. A single PCI
Express lane consists of four wires and can transmit 250 MB in a single direction or 500 MB in both
directions simultaneously. This bandwidth is not affected by what is happening on other PCI Express
buses or legacy PCI/PCI-X buses (provided that total bandwidth can be handled by the CPU and the
memory subsystem). The transmission protocol is somewhat similar to that used for a LAN connection
and contains error correction and detection, packet addressing, and other network features.
PCI Express improves system attributes. PCI Express enables a low-power, scalable, high-bandwidth
communication path with a small number of connections (wires) compared to traditional parallel
interfaces (e.g., PCI).
The PCI Express I/O slots can support other PCI Express cards with lesser bus bandwidth than what is
physically defined for the slot. Use the following table to determine compatibility.
Table 4-5 PCI Express compatibility matrix for xw4400
Mechanical compatibility Electrical compatibility
PCI Express x1 slot x1 cards x1 modes
PCI Express x16 (x4) slot x1, x4, x8, and x16 cards x1 and x4 modes
PCI Express x16 slot x1, x4, x8 and x16 cards x1 and x16 modes
To remove a PCI Express card:
1. Disconnect power from the system (
Predisassembly procedures on page 60), remove the side
access panel (
Side access panel on page 66), and remove the PCI retainer (PCI retainer
on page 77), if installed.
2. Lift the PCI levers 1 by first pressing down and then up.
3. If removing a PCI Express x16 graphics card, press in on the “hockey stick” lever 2 while lifting the
card 3 out of the chassis. Store the card in an anti-static bag.
78 Chapter 4 Removal and replacement procedures ENWW
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