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PCI extended (PCI-X)

The PCI-X bus, PCI Extended, meets the increasing requirements of modern server technology. It was developed by Compaq, Hewlett Packard and IBM and is specified for a clock rate of 133 MHz. Inconjunction with the 64-bit bus, the original version of PCI-X achieves a data transfer rate of 1.1 GB/s.

PCI interface versions

PCI interface versions

PCI-X 2.0 achieves double the data transfer rate of 2.13 GB/s with the same bus width using DDR technology, Double Date Rate (DDR). With PCI-X 533 and PCI-X 1066, the PCI standard has two versions with data transfer rates of 4.2 GB/s and 8.5 GB/s respectively. In these versions, the clock frequency of 133 MHz is quadrupled. PCI-Express offers even higher transfer rates of 10 GB/s at a clock frequency of 1.25 GHz.

The PCI bus and PCI-X are compatible with each other. Since only one device can be operated at clock frequencies above 100 MHz, some motherboards are equipped with several PCI-X buses. PCI-X is also incompatible with PCI Express.

Informations:
Englisch: PCI extended - PCI-X
Updated at: 29.12.2004
#Words: 157
Links: protocol control information (PCI), bus, server, clock rate, megahertz (MHz)
Translations: DE
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