View source for PCI Express

{{no source|date=June 2021}}
'''Peripheral Component Interconnect Express''' ('''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. It is the common [[motherboard]] [[interface]] for [[personal computer]]<nowiki/>s' [[Video card|graphics cards]], [[hard disk drive]] host adapters, [[Solid-state drive|SSDs]], [[Wi-Fi]] and [[Ethernet]] hardware connections.

[[Category:Computer hardware]]



== PCI Express Media ==
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File:LSI_9207-4i4e_PCI-E_SAS_HBA.jpg|A PCIe 3.0 ×8 [[host bus adapter]]

File:PCI-E & PCI slots on DFI LanParty nF4 SLI-DR 20050531.jpg|Various slots on a [[computer motherboard]], from top to bottom: {{unordered list* | PCI Express ×4* | PCI Express ×16* | PCI Express ×1* | PCI Express ×16* | [[Conventional PCI]] (32-bit, 5&nbsp;V)*}}

File:Example PCI Express Topology.svg|Example of the PCI&nbsp;Express topology:white "junction boxes" represent PCI&nbsp;Express device downstream ports. The gray ones represent upstream ports.{{rp|7}}

File:RouterBOARD RB14e, top view.jpg|PCI Express ×1 card containing a PCI Express switch (covered by a small [[heat sink]]), which creates multiple endpoints out of one endpoint and lets multiple devices share it

File:PCie lanes.jpg|The PCIe slots on a motherboard are often labeled with the number of PCIe lanes they have. Sometimes what may seem like a large slot may only have a few lanes. For instance, a ×16 slot with only 4 PCIe lanes (bottom slot) is quite common.

File:PCI Express Terminology.svg|A PCI Express link between two devices consists of one or more lanes, which are [[dual simplex]] channels using two [[differential signaling]] pairs.{{rp|3}}

File:PCIe vs PCI.gif|'''Highly simplified''' topologies of the Legacy PCI Shared (Parallel) Interface and the PCIe Serial Point-to-Point Interface

File:Intel P3608 NVMe flash SSD, PCI-E add-in card.jpg|Intel P3608 NVMe flash SSD, PCIe add-in card

File:Powering of PCIe Slot.png|The main {{val|12|ul=V}} power supply for the PCIe slot is pins B2, B3 (side B) and pins A2, A3 (side A). Power standby {{val|3.3|ul=V}} is pin B10 and A10. PCIe ×1 cards can draw up to {{val|25|ul=W}} and ×16 graphics cards can draw up to {{val|75|ul=W}}, combined.

File:PCI Express Power Supply Connector-female PNr°0438.jpg|8-pin (left) and 6-pin (right) [[Molex Mini-fit Jr.|power connectors]] used on PCI Express cards
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