PCI Express

PCI Express
Peripheral Component Interconnect Express
	Logo
Year created	2003
Created by	Intel; Dell; HP; IBM;
Supersedes	PCI; PCI-X; AGP;
Width in bits	1 per lane (up to 16 lanes)
No. of devices	1 on each endpoint of each connection.
Speed	Dual simplex, up to 242 GB/s
Style	Serial
Hotplugging interface	Yes (with ExpressCard, OCuLink, CFexpress or U.2)
External interface	Yes (with OCuLink or PCI Express External Cabling)
Website	pcisig.com

Two types of PCIe slot on an Asus H81M-K motherboard

PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe or PCI-e,^[2] is a high-speed serial computer expansion bus standard, designed to replace the older PCI, PCI-X and AGP bus standards. It is the common motherboard interface for personal computers' graphics cards, capture cards, sound cards, hard disk drive host adapters, SSDs, Wi-Fi, and Ethernet hardware connections.^[3] PCIe has numerous improvements over the older standards, including higher maximum system bus throughput, lower I/O pin count and smaller physical footprint, better performance scaling for bus devices, a more detailed error detection and reporting mechanism (Advanced Error Reporting, AER),^[4] and native hot-swap functionality. More recent revisions of the PCIe standard provide hardware support for I/O virtualization.

The PCI Express electrical interface is measured by the number of simultaneous lanes.^[5] (A lane is a single send/receive line of data, analogous to a "one-lane road" having one lane of traffic in both directions.) The interface is also used in a variety of other standards — most notably the laptop expansion card interface called ExpressCard. It is also used in the storage interfaces of SATA Express, U.2 (SFF-8639) and M.2.

Format specifications are maintained and developed by the PCI-SIG (PCI Special Interest Group) — a group of more than 900 companies that also maintains the conventional PCI specifications.

^ IBM Power 770 and 780 Technical Overview and Introduction. IBM Redbooks. 6 June 2013. ISBN 978-0-7384-5121-3.
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[1] IBM Power 770 and 780 Technical Overview and Introduction. IBM Redbooks. 6 June 2013. ISBN 978-0-7384-5121-3.

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