Pci Express - HP Xw9400 - Workstation - 16 GB RAM Reference Manual

Hp xw9400 workstation - service and technical reference guide
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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/s in a single direction or 500 MB/s 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 (for example, 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.
Table 5-5
PCI Express compatibility matrix for xw9400
PCI Express
x1 Card
PCI Express
x4 Card
PCI Express
x8 Card
PCI Express
x16 Card
* Slot 1 is for short cards only.
ENWW
Slot 1*
x16 mechanical
x16 mechanical
x8 electrical
Yes
Yes
Yes
Yes
Slot 2
x16 mechanical
x16 electrical
Yes
Yes
Yes
Yes
Removing and replacing components
Slot 4
x16 mechanical
x8 electrical
x16 electrical
Yes
Yes
Yes
Yes
Slot 5
Yes
Yes
Yes
Yes
81

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