PCI Express


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PCI Express

A high-speed hardware interface from Intel for connecting peripheral devices. PCI Express (PCIe) was introduced in 2002, and by the mid-2000s, motherboards had at least one PCIe slot for the graphics card. PCIe is also used for hard drives, SSDs, Wi-Fi and Ethernet. Introduced in 2002 as "Third Generation I/O" (3GIO), PCIe superseded both PCI and PCI-X.

Switched Architecture - Multiple Lanes
Rather than the shared bus of PCI, PCIe provides a switched architecture of up to 32 independent, serial "lanes" that can transfer in parallel, designated 1x to 32x. 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 extend PCIe outside the computer (see external GPU). For PCIe/PCI comparisons, see PCI-SIG. See PCI, ExpressCard, Thunderbolt and PCI-X.

                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 compatible with PCI or AGP. Slots are color coded on the motherboard.







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







A PCIe Motherboard
This Asus motherboard has three x16 PCIe slots for x16, x8 or x4 cards and four x1 slots. (Image courtesy of ASUStek Computer Inc.)







PCIe Replaced AGP for Graphics
The AGP slot gave way to an x16 PCIe slot for the graphics card. (Image courtesy of NVIDIA Corporation.)







PCIe on an M.2 Card
This is a 960GB PCIe SSD contained on an 80x20mm M.2 card. See M.2.
References in periodicals archive ?
The jitter methodology used in USB 3.0 is a Dual-Dirac model similar to that used in PCI Express. Limits are applied to the measurements per the USB 3.0 specification indicating a pass/fail result.
Principales caracteristicas: Soporta procesadores AMD Athlon 64, Athlon 64FX y Athlon 64X2; socket AM2, chipset Nividia nForce 570 SLI; cuatro ranuras para memoria DDR2 Dual Channel a 533, 667 o 800 MHz; dos ranuras PCI Expressx16, una compatible con PCI Express x8, dos ranuras PCI Express x1; tres ranuras PCI de 32 bits; controlador IDE para hasta dos dispositivos; RAID para hasta seis puertos SATAII; soporte para RAID 0, 1, 0+1, J800; audio de ocho canales compatible con Azalia; LAN dual 10/100/1000; soporta hasta dos puertos IEEE 1394; factor de forma ATX
A wide range of NVIDIA's PCI Express architecture-based products were tested by PCI-SIG and judged to meet the PCI-SIG testing requirements, including:
Diodes Incorporated is proud to enhance our high speed serial connectivity offerings with our high performance signal muxes, clock generators and clock buffers for PCI Express 4.0 applications at 16Gbps and Thunderbolt 3 applications at 20Gbps, said Kay Annamalai, Senior Marketing Director, Diodes Incorporated.
Along with the PCI Express switch, Magma is also able to take advantage of IDT's extensive timing portfolio to complete the design of its ExpressBox7 x 8 Gen 2 expansion systems.
Euphonic needed an eight-lane PCI Express interface to meet the high bandwidth requirements of the EGC601 graphics controller, which supports up to five different imaging layers without intervention of the host CPU.
Other features include single-handed hard drive replacement and tool-free access to full height PCI and PCI Express x 16 expansion slots.
Serial Technologies Deliver New Capabilities for Next-Generation Server Storage Serial architectures, specifically Serial Attached SCSI (SAS), Serial ATA (SATA) and PCI Express, have emerged to deliver higher performance by allowing more bandwidth per device pathway than their parallel counterparts.
Up to four PCI Express X8 channels and four 1Gbps Ethernet links are supported through dual ServerWorks Hyper Transport 2000 chipsets, which together provide up to 4GB of bidirectional I/O.
PNY Technologies, Inc., has unveiled a full line of Verto GeForce graphics cards that capitalize on the PCI Express standard announced by the PCI Special Interest Group.
Broadcom Corporation (NASDAQ:BRCM), a provider of silicon solutions enabling broadband communications, has unveiled a new family of Broadcom NetXtreme Gigabit Ethernet (GbE) controllers that implement the advanced PCI Express host interface.
The announced test solution supports both PCI Express transmitter and receiver tests using automation software for the MP1900A.