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microatx listed twice with differing sizes[edit]

My hunch is there is a max and a min - but not at all clear in the Computer form factors box.

If a standard has a max and a min it should be listed as 123 x 234 - 111 x 199 — Preceding unsigned comment added by (talk) 22:45, 22 April 2014 (UTC)

AUX connector[edit]


According to the ATX12V 1.1 power supply design guide this is only required for power supplies with +3.3V output greater than 18A or +5V output greater than 24A. Does anyone have a copy of the ATX12V 1.0 spec to confirm if this is the case there too? Plugwash (talk) 11:05, 1 September 2010 (UTC)


A 8 pin aux connector is required by Intel Core processors, that is often meantioned as being ATX on recent power supplies. If this is gona be ATX standard it has to be watched ,right now the ATX standard doesnt meantion this or? Is a meantion in the article worthwhile, that the ATX standard is extended like that? (talk) 18:10, 29 January 2011 (UTC)

Some modern systems use the 8 pin "EPS connector" (from the EPS12V standard) instead of the 4-pin "P4 connector" to provide more power headroom for over-clocking. This isn't a requirement of "intel core processors" in general though. Plugwash (talk) 02:40, 14 September 2011 (UTC)
My latest AMD system physically needed a 8 pin connector to get to POST, and did not work with a 4 pin connector.--Unifoe (talk) 21:48, 17 March 2013 (UTC)


This section seems to be slightly outdated. EVGA has already released its HPTX motherboard (it's called EVGA SR-2 I guess). —Preceding unsigned comment added by (talk) 19:27, 18 April 2011 (UTC)

ATX-2-AT adapter cable specification[edit]

I created this ATX-2-AT adapter assignement table. Maybe it could be useful? It's not fully completed. I tested it anyway, and it works. I did notice however that the "not connected" on the ATX connector is used for -12V in some cases (FSP Group Inc). Something to watch out for perhaps. Electron9 (talk) 01:11, 19 June 2011 (UTC)

Merger proposal[edit]

I doubt that this will have a tremendous impact on the article even if it goes ahead, but for form's sake I have proposed that HPTX (Form Factor) is merged into the existing coverage of the form factor here. I you want to comment on this proposal please do so on that talk page rather than fragmenting the discussion. Crispmuncher (talk) 21:24, 7 July 2011 (UTC).

Power switch false and misleading statements[edit]

The power switch section says "While this switch functions as if were a physical switch and disconnects AC power from the power supply (as required by UL),", but this cannot be true: the entire 5V-standby circuitry remains powered on and thus the AC must be present. Apart from the wasted energy this also poses a significantly higher risk of damage by voltage spikes on the line. Considering that most home users will neither use WoL or power on by keyboard, but also will not go through the trouble of using the back-side switch (if present), this means higher risk (and cost) for negligible gain.

The reference to an UL requirement has no citation, and I don't see how such a requirement could be accommodated while maintaining standby power. I have not yet modified the article in case someone does find a proper citation. -- (talk) 12:45, 14 September 2012 (UTC)

ATX plug/socket part numbers are a good idea[edit]

I know Wtyshymanski is gonna chew my ass out over this, but I really think part numbers for the connectors belong in this article. Mainly because the connector manufacturers do not make any attempt to declare "this part is what the ATX standard uses" in their product descriptions.

To them it's just another part in a series of theirs, which someone ELSE declared part of some global interconnect standard. Yawn, is that their concern? Apparently not.

Just try searching for the ATX socket part number and see how far you get. Apparently only Molex makes it? Does AMP make a compatible connector? Who knows. That's the sort of detail this article could use.

Also, just try finding the 20+4 motherboard adapter plug assembly with the 4 breakaway pins, or the 24 pin socket intended to mate with the 20-pin plug or 24-pin plug. Finding the part numbers for these ATX components is a nightmare. DMahalko (talk) 22:01, 28 October 2012 (UTC)

"Just try searching for the ATX socket part number and see how far you get. Apparently only Molex makes it?
The ATX specification says or equivilent. When you are as big as a PC PSU or motherboard vendor you can go to a connector manufacturer and say "I want an equivilent to this connector from your competitor molex" and they will likely oblige.
"Does AMP make a compatible connector? "
I think one of the AMP "MATE-N-LOK" ranges is compatible with the molex mini-fit range used for ATX connectors but i'm not positive.
"Also, just try finding the 20+4 motherboard adapter plug assembly with the 4 breakaway pins, or the 24 pin socket intended to mate with the 20-pin plug or 24-pin plug."
Yeah :(, I think the problem with the wide tabs and breakaway connectors is that they have never been part of either a standard range of connectors OR a PSU standard. They were things invented by PSU and motherboard vendors to improve compatibility (the standard connectors are sorta compatible between 20 pin and 24 pin but there can be problems with things blocking the overhang and the tabs may not line up).
"Finding the part numbers for these ATX components is a nightmare."
Finding connector part numbers in general is a nightmare because afaict there are no real standards. Connector vendors often make clones of each others connectors but (presumablly for legal reasons) they don't like to advertise the compatibility on their websites.
-- Plugwash (talk) 01:54, 31 October 2012 (UTC)


I see a lot of documentation on what wire carries how much volt. How much amps do they usually carry?

I know it depends on the PSU wattage, but an average would be nice (eg: For a 500W PSU). — Preceding unsigned comment added by (talk) 06:29, 21 January 2013 (UTC)

I originally marked the 13 amp rating for the MinifitJR connector as dubious. It is only 8 amps per conductor with 18 Gauge wire, 24 pin connector. I have now corrected it based on this document: [1] I found a (broken by JavaScript) link to it on the cited page (cite note 11). They may not like hot-linking. (talk) 17:17, 22 March 2014 (UTC)


Mini ATX could mean either 284*204 or 150*150mm. The ATX comparison picture uses 284*204mm, the table uses 170*170mm.2001:980:A381:1:754F:42C2:1603:EA96 (talk) 15:42, 24 January 2013 (UTC)

Possible error[edit]

See File talk:ATX PS signals.svg#Possible error. Wtmitchell (talk) (earlier Boracay Bill) 23:10, 16 April 2013 (UTC)

ATX 2.4[edit]

Has anyone information on the ATX 2.4 specifications? — Preceding unsigned comment added by (talk) 19:54, 12 October 2013 (UTC)

Error on connector pinout[edit]

Some versions of the Intel ATX Specification (i.e. Version 2.2) contained a small, but important, typo on the Main Power Connector drawing (figure 8) from which the Wiki drawing ( was sourced. This has been corrected in the current Intel spec. (i.e. Section 4.2.2 figure 5), however the Wiki drawing has not. The error is that "PWR_OK" is shown as "PWR_ON". Since there is already a "PS_ON" signal, this is confusing.

Note that the official specification calls this signal "PWR_OK". "Power good" was IBM's term for the signal as used by the IBM PC, and the ATX spec references it (in quotes) as a class of signal. It's proper name is "PWR_OK" (section 3.3.1, — Preceding unsigned comment added by (talk) 17:03, 4 February 2015 (UTC)

I'm not the original author of the drawing, but tonight I created an update that fixed the TEXT to match the official documents. I just now noticed these other problems, so I'll investiage, then come back and fix them on the next update. • SbmeirowTalk • 09:33, 5 February 2015 (UTC)
Yes check.svg DoneSbmeirowTalk • 16:07, 5 February 2015 (UTC)

External links modified[edit]

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