PCI Express

Originally known as 3rd Generation I/O (3GIO), PCI Express, or PCIe, was approved as a standard on July 2002 and is a computer bus found in computers. PCI Express is designed to replace PCI and AGP and is available in several different formats: x1, x2, x4, x8, x12, x16 and x32. Below are some graphic illustrations of what the PCI Express would look like on the motherboard. 

• The official specifications for PCI Express can be found at http://www.pci-sig.com 

Also see: Bus, Motherboard definitions, PCI