PCI is a bus standard developed by intel corporation. PCI slots are 32-bit wide in bus. This slot is used for attaching perpheral devices to the motherboard. Additional components such as Ethernet card and internal modem can be attached to the motherboard. This slots typically works at 33 MHz. However some newer variants are available that have a 64-bit wide bus and work at 33 MHz or 66 MHz. Data transmission Rate of PCI is 133 Mbps.
PCI Extended (PCI-X )
PCI Extended (PCI-X) is a standard designed jointly by HP, IBM and Compaq to increase the performance of high-bandwidth devices , such as Gigabit Ethernet and Fibre Channel.PCI- X is fully backward compatible with PCI and Data transmission rate is 1 GBPS. IT comes in Two variants. PCI-X 1.0 , with a maximum clock speed of 133 MHz , and PCI-x 2.0, with 533 MHz. BUt 2/0 also has other features like ECC ( Error Correction Code ) and 1.5 signalling.
PCI Express (PCI-E )
PCI express or PCI-E is the latest peripheral component interconnect special interests groups specification for the I/O bus. It is used for attaching peripheral devices to the motherboard. The PCI express extends the capabilities of PCi bus by having 32 differential pair of wires or lanes (X32) for high speed bidirectional serial data commucnication. It has point-to-point, hot pluggable and hot -swappable system bus that's fully compatible with PCI, atleast on the software level. Data transmission rate of each lane is 250 MBps. The initial version of PCI Express supports 0.8V signalling at 2.5 GHz. These wires can be combined to form bus architecture of x2, x4, x8, x16 and x 32.
PCI Extended
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