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External express card slot

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Not external express card slot be confused with PCI-X. For Engineering, Procurement, Construction and Installation, see EPCI.


One device each on each endpoint of each connection. PCI Express switches can create multiple endpoints out of one endpoint to allow sharing one endpoint with multiple devices. 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.

900 companies that also maintain the conventional PCI specifications. 0 is the latest standard for expansion cards that are in production and available on mainstream personal computers. PCI Express device downstream ports, while the gray ones represent upstream ports.

PCI uses a shared parallel bus architecture, in which the PCI host and all devices share a common set of address, data and control lines. In contrast, a PCI Express bus link supports full-duplex communication between any two endpoints, with no inherent limitation on concurrent access across multiple endpoints.

In terms of bus protocol, PCI Express communication is encapsulated in packets. PCI slots and PCI Express slots are not interchangeable. PCI system software can detect and configure newer PCI Express devices without explicit support for the PCI Express standard, though new PCI Express features are inaccessible.