Talk:PCI Express/Archive 2016

Unidentified external connector

Time marker 2:39 of this video shows a 7x4=28-pin, copper-looking connector that carries PCIe gen 3 x4 bus. It doesn't appear to be OCuLink or iPASS. There's an adapter card (apparently named HX-2 and codenamed ISLEY) with the interface. The card was designed by DSSD (bought by EMC in 2014-05) and shown at time marker 2:49, and also in this DSSD lab tour report from 2015-05-06, and also this eBay listing has an image of the 28-pin socket. Does this connector have a name? Is there a standards body identifier associated with it? If so did DSSD/EMC contribute the standard and is it RAND or will it remain proprietary with no third party vendors of adapter cards, let alone storage chassis? Noiseiron (talk) 19:05, 29 February 2016 (UTC)

Looks purely proprietary. There's quite a bit of stuff like this around. --Zac67 (talk) 20:01, 29 February 2016 (UTC)

Mention 'asynchronous' / 'synchronous' in comparison between multi-lane serial vs parallel

It seems that the change from 'synchronous to 'asynchronous communication is the thing which allows multi gigahertz communication speeds on the bus. This seems to be implied, but is not actually stated. Would you agree this would improve the doc? — Preceding unsigned comment added by 2600:1016:B01A:6A06:E5C7:8459:A02:1E67 (talk) 18:32, 21 March 2016 (UTC)

Asynchronous as in what? PCI has been synchronous from the beginning. PCIe's performance comes from abandoning parallel transmission limits due to skew and xtalk issues plus using p2p connects instead of a single shared bus. --Zac67 (talk) 21:43, 21 March 2016 (UTC)

@Zac67: I think that's what he/she meant: the individual PCIe lanes aren't synchronized with regard to each other, hence asynchronous? -- intgr [talk] 08:47, 18 April 2016 (UTC)

There needs to be a maximum clock skew between the lanes of a link to re-align the data streams (Base Spec 3.0 Table 4-24): 20/8/6 ns for 2.5/5/8 GT/s respectively. However, I wouldn't call that synchronous (neither do PCISIG) since each lane uses its own clock, but it isn't totally asynchronous either. Do you think this is what the OP meant? --16:50, 18 April 2016 (UTC)

Photos about all PCI Express types of slots?

Hi.

I see that there isn't a photo of PCIe2 x8 in this article.

Could someone introduce something like this http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c01970872 in the article?

Thanks. — Preceding unsigned comment added by 86.131.137.23 (talk) 11:38, 29 May 2016 (UTC)

The power section (to the PSU) is rather short

The 8 pin power connector has 3 times 12 volt for 150 watt, the 6 pin power connector has 2 times 12 volt for 75 watt. Why? Apparantly for the 6 pin power connector they use half the amperage but what is the logic behind this? Why not use 1 times 12 volt with the same amperage for the 6 pin power connector and only need 4 pins? What is the function of the sense pins? I think this section could use some elaboration. 145.132.75.218 (talk) 10:55, 19 August 2016 (UTC)