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PCI is a bus standard for interfacing peripheral devices with a processor's chipset. Typical PCI products include network interface cards, modems, sound cards, and video editing boards.
On mainstream motherboards, PCI version 2.1 with 33 MHz bus clocking and 32 bit bud width is most typical. This offers bandwidth of up to 133 MBps. Vendors haven't widely adopted PCI 2.3 with 66 MHz bus clocking, so not too many compatible peripherals are available, though you will find some motherboards that support this standard.
Another development in the area of parallel PCI buses is known as PCI-X. These slots appear most frequently on workstation and server motherboards, where higher bandwidth for such devices as SCSI controllers or multi-port network interface cards is needed. As an example, PCI-X 1.0 offers bandwidth of up to 1 GBps at a bus clock of 133 MHz with 64 bit bus width.