PCI Express
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PCI Express, officially abbreviated as PCIe or PCI-e, is a high-speed serial computer expansion bus standard, designed to replace the older PCI, PCI-X and AGP bus standards. Wikipedia
External interface: Yes (with OCuLink or PCI Express External Cabling)
No. of devices: 1 on each endpoint of each connection.
Width in bits: 1 per lane (up to 16 lanes)
Year created: 2003; 21 years ago