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.
For example, a PCI Express x8 card does not work in a PCI Express x1 slot, but a PCI Express x1 card
works in a PCI Express x8 slot.
NOTE: Slot 2 and Slot 4: The HP xw6400 Workstation contains two PCI Express x8 slots that support
x4 bandwidth. If a PCI Express x8 card is plugged into a PCI Express x8 slot, the card runs at x4
bandwidth.
Slot 3: The HP xw6400 Workstation contains one PCI Express x16 slot that supports x4 bandwidth. If
a PCI Express x8 or x16 card is plugged into the PCI Express x8 slot, the card runs at x4 bandwidth.
The maximum power for a PCI Express x16 graphics card is 75W.
Table 4-6 PCI Express compatibility matrix for xw6400
Slot 1
x16 mechanical
x16 electrical
Slot 2 and Slot 4
x8 mechanical
x4 electrical
Slot 3
x16 mechanical
x4 electrical
PCI Express x1 card Y Y Y
PCI Express x4 card Y Y Y
PCI Express x8 card Y Y Y
PCI Express x16 card Y N Y
PCI removal
1. Disconnect power from the system (Predisassembly procedures on page 57), remove the side
access panel (
Side access panel on page 63), and remove the PCI retainer (PCI retainer
on page 75).
2. Release the PCI retention clamp by first pressing down on the green snaps 1 and rotating the PCI
retention clamp upward.
3. For full length PCI cards, disengage the release snap on the front chassis card guide (not
illustrated).
4. Lift the PCI card out 2 of the chassis. Store the card in an antistatic bag.
ENWW Removal and replacement of components 77
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