Editing PCI Express (section)

==== Power ====
[[File:Powering of PCIe Slot.png|thumb|upright=1.25|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 x1 cards can draw up to {{val|25|ul=W}} and x16 graphics cards can draw up to {{val|75|ul=W}}, combined.<ref>{{cite web |date=2022-01-16 |title=Where Does PCIe Cable Go? |url=https://greatpcreview.com/guides/where-does-pcie-cables-go/ |access-date=2022-06-10 |language=en-US}}</ref>]]

===== Slot power =====
<!--
Please DO NOT add the claim that the PCI express 2.x standard adds support for up to 150&nbsp;W from the slot itself without a very good reference. While several references make the claim, particularly around the time of release, other references particularly those relying on the spec. dispute this. See the talk page discussion dated November 2012 for details.
-->
All PCI express cards may consume up to {{val|3|ul=A}} at {{val|+3.3|ul=V}} ({{val|9.9|ul=W}}). The amount of +12&nbsp;V and total power they may consume depends on the form factor and the role of the card:<ref name="CEM1.1" />{{rp|35–36}}<ref name="jArAO" /><ref>''PCI Express Base Specification, Revision 1.1'' Page 332</ref>
* x1 cards are limited to 0.5&nbsp;A at +12{{nbsp}}V (6&nbsp;W) and 10&nbsp;W combined.
* x4 and wider cards are limited to 2.1&nbsp;A at +12{{nbsp}}V (25&nbsp;W) and 25&nbsp;W combined.
* A full-sized x1 card may draw up to the 25&nbsp;W limits after initialization and software configuration as a high-power device.
* A full-sized x16 graphics card may draw up to 5.5&nbsp;A at +12{{nbsp}}V (66&nbsp;W) and 75&nbsp;W combined after initialization and software configuration as a high-power device.<ref name="PCIe card 2" />{{rp|38–39}}

===== 6- and 8-pin power connectors =====
[[File:PCI Express Power Supply Connector-female PNr°0438.jpg|thumb|upright=1.25|8-pin (left) and 6-pin (right) [[Molex Mini-fit Jr.|power connectors]] used on PCI Express cards]]

Optional connectors add {{val|75|ul=W}} (6-pin) or {{val|150|ul=W}} (8-pin) of +12&nbsp;V power for up to {{val|300|ul=W}} total ({{nowrap|2 @ 75&nbsp;W + 1 @ 150&nbsp;W}}).
* Sense0 pin is connected to ground by the cable or power supply, or float on board if cable is not connected.
* Sense1 pin is connected to ground by the cable or power supply, or float on board if cable is not connected.

Some cards use two 8-pin connectors, but that has not been standardized {{as of|lc=y|2018}}. Therefore, such cards must not carry the official PCI Express logo. This configuration allows 375&nbsp;W total ({{nowrap|1 @ 75&nbsp;W + 2 @ 150&nbsp;W}}) and will likely be standardized by PCI-SIG with the PCI Express 4.0 standard.{{Update inline|reason=PCI Express is at 5.0 already…|date=May 2021}} The 8-pin PCI Express connector should not be confused with the [[EPS12V]] connector, which is mainly used for powering SMP and multi-core systems. The power connectors are variants of the Molex Mini-Fit Jr. series connectors.<ref name="JuErgh" />
{| class="wikitable" style="background:white; border:0"
|+ Molex Mini-Fit Jr. part numbers<ref name="JuErgh" />
! Pins
! Female/receptacle <br />on PS cable
!Male/right-angle <br />header on PCB
|-
|6-pin
|45559-0002
|45558-0003
|-
|8-pin
|45587-0004
|45586-0005, 45586-0006
|}
{| class="wikitable" style="border:0"
! colspan=2 style="background:white; border:0" | 6-pin power connector (75&nbsp;W)<ref name="o2GFI" />
| rowspan=10 style="border:0; background:white"|
! colspan=2 style="background:white; border:0" | 8-pin power connector (150&nbsp;W)<ref name="uLc7Q" /><ref name="CEM3.0" /><ref name="mcd6L" />
| rowspan=10 style="border:0;background:white"| [[File:PCIe6connector.svg|thumb|185px|<small>6 pin power connector pin map</small>]]<br />
                               [[File:PCIe8connector.svg|thumb|224px|&emsp;&emsp;<small>8 pin power connector pin map</small>]]
|-
! Pin !! Description
! Pin !! Description
|-
| {{0}}1 || +12&nbsp;V
| {{0}}1 || +12&nbsp;V
|-
| {{0}}2 || {{n/a|Not connected (usually +12&nbsp;V as well)}}
| {{0}}2 || +12&nbsp;V
|-
| {{0}}3 || +12&nbsp;V
| {{0}}3 || +12&nbsp;V
|-
| colspan=2 style="background:white; border:0" |
| {{0}}4 || Sense1 (8-pin connected{{efn-ua|When a 6-pin connector is plugged into an 8-pin receptacle the card is notified by a missing ''Sense1'' that it may only use up to 75&nbsp;W.}})
|-
| {{0}}4 || Ground
| {{0}}5 || Ground
|-
| {{0}}5 || Sense
| {{0}}6 || Sense 0 (6-pin or 8-pin connected)
|-
| {{0}}6 || Ground
| {{0}}7 || Ground
|-
| colspan=2 style="background:white; border:0" |
| {{0}}8 || Ground
|}
{{notelist-ua}}

===== 12VHPWR connector =====
{{Excerpt|16-Pin 12vHPWR connector|templates=-Advert}}

===== 48VHPWR connector =====
In 2023 PCIe CEM 5.1 introduced a connector for 48 Volts with two current-carrying contacts and four sense pins.<ref name="PCIe5.1 CEM">''PCI Express Card Electromechanical Specification Revision 5.1, Version 1.0'', 30 March 2023 – 10. PCI Express 48VHPWR Auxiliary Power Connector Definition</ref> The contacts are rated for 15 Amps continuous current. The 48VHPWR connector can carry 720 watts. Later it was removed and an incompatible 48V 1x2 connector was introduced where Sense0 and Sense1 are located farthest from each other.
	
{| class="wikitable"
|+ 48VHPWR pinout
! Pin !! Signal
|-
| P1 || +48 V
|-
|P2 || Ground
|-
| S1 || CARD_PWR_STABLE
|-
| S2 || CARD_CBL_PRES#
|-
| S3 || SENSE0
|-
| S4 || SENSE1
|}