PCI Express

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PCI Express

A high-speed hardware interface from Intel for connecting peripheral devices. Introduced in 2002 as "Third Generation I/O" (3GIO), PCI Express (PCIe) superseded both PCI and PCI-X, and new motherboards may come with a mix of PCI and PCIe slots or only PCIe. See PCI-X.

Since the mid-2000s, computer motherboards have at least one PCIe slot for the graphics card. PCIe is also used for internal Wi-Fi cards, 10 Gigabit Ethernet cards, hard drives and solid state drives (SSDs). See SATA Express.

Switched Architecture - Multiple Lanes
Rather than the shared bus structure of PCI, PCIe provides a switched architecture of channels that can be combined in x2, x4, x8, x16 and x32 configurations, creating a parallel interface of independently controlled "lanes." The switch backplane determines the total bandwidth, and cards and motherboards are compatible between versions.

Internal and External for Laptops
A mini version of PCIe was developed for laptops (see Mini PCI Express) and ExpressCard and Thunderbolt interfaces are sometimes used to extend PCI Express outside the computer (see external GPU). For PCI/PCI Express comparisons, see PCI-SIG. See PCI, ExpressCard, Thunderbolt, PCI-X and SATA Express.

                Data TransferPCI Express      (Bytes/Sec)Version      1 Lane      16 Lanes

    1.0        250 MBps     4 GBps
    2.0        500 MBps     8 GBps
    3.0          1 GBps**  16 GBps**
    4.0          2 GBps**  32 GBps**
  ** = rounded


Different Size Slots
PCIe is not plug compatible with PCI. The x1 slot is a single-lane implementation, while the x16 slot supports 16 lanes for high-speed data transfer.







Parallel Transfer in Serial Form
Each lane is an independent single-bit serial channel on the PCIe backplane.







Only PCIe on the Motherboard
This Asus Z87 motherboard has four x1 and three x16 PCIe slots and no PCI. The x16 slots accept x16, x8 or x4 cards. (Image courtesy of ASUStek Computer Inc.)







AGP to PCI-Express
The AGP slot gave way to an x16 PCI Express slot for the graphics card. The cards have different edge connectors to ensure they plug into the right slot. (Image courtesy of NVIDIA Corporation.)
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In this context, the volume of subsea tenders continues at a high level, especially for larger multi-year EPCI projects.
The contractor will also be responsible for development of the EPCI bid list.
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com/ ), the global number one vendor of strong user authentication products to the financial sector, today announced that it is the first vendor to receive the full EPCI (Electronic Payment Certification Institute) certification.
McDermott s integrated EPCI capabilities are critical to these offshore projects, said Tom Mackie, McDermott s Vice President, Middle East.
The fact that we are the first vendor to be EPCI certified, adds a crucial competitive advantage to our offering to the Belgian market," said Jan Valcke, VASCO's President and COO.
The EPCI contract, valued at just under US$600 million, will take three years to complete from contract signing to first production in late 2004.
Contract award: diagram intermunicipal cooperation - assistance for the definition of the future organizational structure as part of the merger of the epci.
Norsk Hydro has awarded Technip-Coflexip, through its Norwegian affiliate Technip Offshore Norge AS, the EPCI (engineering, procurement, construction, installation) contract for the Oseberg South--J Structure flowlines and umbilical.
Coflexip Stena Offshore (Nasdaq: CXIPY; French Reglement mensuel: CFI FP) announced today that Coflexip Stena Offshore Norge AS, its Norwegian entity, has been awarded two EPCI contracts in Norway, one by A/S Norske Shell, and the other by ESSO Exploration & Production Norway AS, that together amount to over EUR 60 million.