11 Facts About PCIe

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.

The announced design preserves the PCIe interface, making it compatible with the standard mini PCIe slot.

Since, PCIe has undergone several large and smaller revisions, improving on performance and other features.

Mobile PCIe specification allows PCI Express architecture to operate over the MIPI Alliance's M-PHY physical layer technology.

PCIe link is built around dedicated unidirectional couples of serial, point-to-point connections known as lanes.

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Connection between any two PCIe devices is known as a link, and is built up from a collection of one or more lanes.

In both cases, PCIe negotiates the highest mutually supported number of lanes.

PCIe sends all control messages, including interrupts, over the same links used for data.

The PCIe specification refers to this interleaving as data striping.

In virtually all modern PCs, from consumer laptops and desktops to enterprise data servers, the PCIe bus serves as the primary motherboard-level interconnect, connecting the host system-processor with both integrated peripherals and add-on peripherals .

Theoretically, external PCIe could give a notebook the graphics power of a desktop, by connecting a notebook with any PCIe desktop video card ; this is possible with an ExpressCard or Thunderbolt interface.