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Peripheral Component Interconnect Express, better known as PCI Express (and abbreviated PCIe or PCI-E) and is a computer expansion card standard. PCI-E is used in motherboard-level connections and as an expansion card interface. The new standard for personal computers is called PCIe 3.0. One of the improvements of PCI-E over its predecessors is a new topology allowing for the faster exchange of data.
The new PCI-E 3.0 technology is different from the former PCI, PCI-X and AGP boards in many ways:
The following are the rates of transmission and bandwidth for the various PCI-E busses. These rates are for total transmission in both directions, 50% being in either direction:
By comparison a PCI card has bandwidth of 132 MB/s; AGP 8x: 2,100 MB/s; USB 2.0: 60 MB/s; IDE: 100 to 133 MB/s; SATA: 150 MB/s; SATA II: 300 MB/s; Gigabit Ethernet: 125 MB/s; and Firewire 800: approx. 100 MB/s.