PCI Express
PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe,1 is a high-speed standard used to connect hardware components inside computers. It is designed to replace older expansion bus standards such as PCI, PCI-X and AGP. Developed and maintained by the PCI-SIG (PCI Special Interest Group), PCIe is commonly used to connect graphics cards, sound cards, Wi-Fi and Ethernet adapters, and storage devices such as solid-state drives and hard disk drives.2
Compared to earlier standards, PCIe supports faster data transfer, uses fewer pins, takes up less space, and allows devices to be added or removed while the computer is running (hot swapping). It also includes better error detection and supports newer features like I/O virtualization for advanced computing needs.3
PCIe connections are made through lanes, which are pairs of conductors that send and receive data. Devices can use one or more lanes depending on how much data they need to transfer.4 PCIe technology is also used in laptop expansion cards (like ExpressCard) and in storage connectors such as M.2, U.2, and SATA Express.
Printed 2026-10-25.
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Footnotes
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Mayhew, D.; Krishnan, V. (August 2003). “PCI express and advanced switching: Evolutionary path to building next generation interconnects”. 11th Symposium on High Performance Interconnects, 2003. Proceedings. pp. 21–29. doi:10.1109/CONECT.2003.1231473. ISBN 0-7695-2012-X. S2CID 7456382. ↩
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“Definition of PCI Express”. PCMag. ↩
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Zhang, Yanmin; Nguyen, T Long (June 2007). “Enable PCI Express Advanced Error Reporting in the Kernel” (PDF). Proceedings of the Linux Symposium. Fedora project. Archived from the original (PDF) on 10 March 2016. Retrieved 8 May 2012. ↩
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https://www.hyperstone.com Flash Memory Form Factors – The Fundamentals of Reliable Flash Storage, Retrieved 19 April 2018 ↩