PCI Express x16
The PCI Express x16 graphics interface (also called PCIe x16) offers increased bandwidth and scalability over the previous AGP8X generation. PCI Express x16 allows up to 4 GB/s of peak bandwidth per direction, and up to 8 GB/s concurrent bandwidth. PCI-Express x16 is used by the Intel 915 and 925 and other chipsets which support PCI-Express.
See also PCI Express.