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A connection between any two PCIe devices is known as a link, and is built up from a collection of 1 or more lanes. All devices must minimally support single-lane (x1) link. Devices may optionally support wider links composed of 2, 4, 8, 12, 16, or 32 lanes. This allows for very good compatibility in two ways:
a PCIe card will physically fit (and work correctly) in any slot that is at least as large as it is (e.g., an ×1 sized card will work in any sized slot);
a slot of a large physical size (e.g., ×16) can be wired electrically with fewer lanes (e.g., ×1, ×4, or ×8) as long as it provides the power and ground connections required by the larger physical slot size.
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