PCI Express

(redirected from Epci)
Also found in: Acronyms.

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 Introduced in 2002 as "Third Generation I/O" (3GIO), PCI Express (PCIe) superseded both PCI and PCI-X, and new motherboards may come with a mix of PCI and PCIe slots or only PCIe.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.)
References in periodicals archive ?
Heerema Fabrication Group, as the main contractor, will manage the overall project from Houston and subcontract the EPCI scope, including offshore hook-up and commissioning of the platform in Equatorial Guinea, to third parties.
The contractor will also be responsible for development of the EPCI bid list.
We are very excited about delivering RIBs iTWO technology to a leader in the EPCI industry and adding a strong partner to the RIB family, comments Mickey Carr, CTO of RIB Americas.
EPCI services company McDermott International (NYSE:MDR) revealed on Monday the receipt of a USD454m agreement from PEMEX Exploracion y Produccion for engineering, procurement, construction & installation (EPCI) for the Abkatun-A2 platform in Mexico.
The original scope was for an EPCI project for structures including a tripod jacket, deck and flare tower and some 26 miles of a 24-inch subsea pipeline.
The five-year alliance agreement makes available the complementary assets of the two companies for ultradeepwater EPCI projects in all subsea markets.
BSP will buy PSP shares in increments of EUR400,000 on activation of each MWpA'A of solar power covered by the EPCI agreement.
In this framework, we expect to participate actively in the growing number of major new subsea EPCI projects currently being tendered, whose offshore installation phases are generally in 2015 and beyond.
Contract notice: Studies of planning / energy programming of epci de l~oise.
EPCI services company McDermott International (NYSE:MDR) disclosed on Thursday that it has received a lump sum contract for brownfield work in various fields offshore Saudi Arabia from Saudi Aramco through the second quarter of 2018.
Ray's Batam facility, the company differentiates itself from its competitors through its EPCI (engineering, procurement, construction, installation) value proposition.
DeepOceans Commercial Director for Subsea Services, Rolf Ivar Srdal, stated the award of this EPCI contract demonstrates our customers confidence is DeepOceans ability to deliver tailor made and efficient solutions both in terms of technical ingenuity and offshore operations.