Talk:PCI Express

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On 2 March 2010, PCI Express was linked from Slashdot, a high-traffic website. (Traffic)

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"full-size" -- 10W vs 25W

https://en.wikipedia.org/wiki/PCI_Express#Power

the 1st bulleted item says x1 cards are limited to 10W.
the 3rd bulleted item says "full-size" x1 cards may make a grab for 25W.

but what is "full-size"? it is nowhere defined in this article. that is not an official term.

"PCI Express® Card Electromechanical Specification Revision 2.0" section "4.2. Power Consumption" explains the 10W limitation exists for HALF-LENGTH x1 cards; those which are less than 7 inches deep. the reason is for heat dissipation via simple convection.

snippet:

Notes: 1. A standard height x1 add-in card intended for desktop applications is limited in length to a half-length add-in card and 10 W maximum power dissipation. A standard height x1 add-in card intended for server I/O applications with 25 W maximum power dissipation must be greater than or equal to 177.80 mm (7.0 inches) in length, but must not exceed a full-length add-in card. See Table 6-1 for add-in card size definitions. The same server I/O add-in card must, at initial power-up, not exceed 10 W of power dissipation, until configured as a high power device, at which time it must not exceed 25 W of power dissipation. Refer to Chapter 6 of the PCI Express Base Specification, Revision 1.1 for information on the power configuration mechanism.

"PCI Express® Card Electromechanical Specification Revision 3.0" section "4.2. Power Consumption" maintains the ordinary half-length x1 card's 10W limit, but increases other cards' limits to 75W after configuration.

snippet:
• A x1 standard height, half-length card is limited to a 10 W maximum power dissipation. • A x1 low profile card is limited to a 10 W maximum power dissipation. • A x1 standard height, full-length card is limited to a 10 W maximum power dissipation at initial power up. When the card is configured for high power, by default, it must not exceed a 25 W maximum power dissipation or optionally it must not exceed a 75 W maximum power dissipation. A x4/x8 or a x16 standard height or low profile card is limited to a 25 W maximum power dissipation at initial power up. When a card is configured for high power, it must not exceed a 75 W maximum power dissipation.

As can be seen, the Revision 3.0 info (circa 2013) substantially supersedes the content in this Wikipedia article https://en.wikipedia.org/wiki/PCI_Express#Power which is at this point woefully obsolete and inaccurate.

PCI Express Mini -Pin layout, and voltages

PCI Express Mini Card Pin layout should be included. And, PCI Express Mini voltages are stated 1,5 and 3,3 V, whereas the msata variation is specified 5 V. Could somebody resolve this? 87.185.213.192 (talk) 16:41, 25 March 2024 (UTC)[reply]

Broken citation

^: 35–36 in slot power 129.130.18.193 (talk) 02:09, 20 April 2024 (UTC)[reply]

Cabling

The 'cabling' section stops at OCuLink-2; it looks like PCI-SIG put out standards in early 2024 for PCIe 5.0 (and 6.0) cabling: https://www.anandtech.com/show/21379/pcisig-completes-copprlink-cabling-standard-pcie-50-60-get-wired. This round is called 'CopprLink', not 'OCuLink' -- no more allusion to a dream of eventually including optical cabling. 135.180.194.206 (talk) 06:36, 19 May 2024 (UTC)[reply]

Should add: the linked article notes that there is a working group established last year to create an optical cabling standard--so they haven't dropped the dream so much as separated it from the standard they're calling CopprLink.