Editing ATX (section)

== Overview ==
ATX is the most common motherboard design.<ref>{{Cite book|title = Authorized Cert Guide: CompTIA A+|last1 = Mark|first1 = Soper|publisher = Pearson Education|date = September 2012|isbn = 978-0-7897-4850-8|last2 = Prowse|first2 = David|last3 = Mueller|first3 = Scott}}</ref> Other standards for smaller boards (including [[microATX]], [[FlexATX]], [[nano-ITX]], and [[mini-ITX]]) usually keep the basic rear layout but reduce the size of the board and the number of expansion slots.  Dimensions of a full-size ATX board are {{convert|12|xx|9.6|in|mm|0|abbr=on}}, which allows many ATX chassis to accept [[microATX]] boards.  The ATX specifications were released by Intel in 1995 and have been revised numerous times since. The most recent ATX motherboard specification is version 2.2.<ref name="formfactors_org_atx22">{{cite web |url=http://www.formfactors.org/developer/specs/atx2_2.pdf |title=ATX Specification - Version 2.2 |author=<!--Staff writer(s); no by-line.--> |access-date=April 4, 2014 |archive-url=https://web.archive.org/web/20120725150314/http://www.formfactors.org/developer/specs/atx2_2.pdf |archive-date=2012-07-25 |url-status=dead }}</ref> The most recent ATX12V power supply unit specification is ATX 3.0 released in February 2022.<ref>{{cite web|url=https://edc.intel.com/content/www/us/en/design/ipla/software-development-platforms/client/platforms/alder-lake-desktop/atx-version-3-0-multi-rail-desktop-platform-power-supply-design-guide/2.0/revision-history/ |title=ATX Version 3.0 Multi Rail Desktop Platform Power Supply Design Guide|work=[[Intel]]|access-date=October 8, 2024}}</ref><ref>{{cite news|url=https://www.anandtech.com/show/21367/the-xpg-core-reactor-ii-ve-850w-atx-31-psu-review/2|title=Intel's ATX v3.0 PSU Standard Has More Power for GPUs|first=Aris|last=Mpitziopoulos|work=[[Tom's Hardware]]|date=March 4, 2022|access-date=October 8, 2024|quote=On February 1st, 2022, the ATX12V v3.0 spec became final...}}</ref><ref>{{cite news|url=https://www.anandtech.com/show/21367/the-xpg-core-reactor-ii-ve-850w-atx-31-psu-review/2|title=The XPG Core Reactor II VE 850W PSU Review: Our First ATX 3.1 Power Supply|author=E. Fylladitakis|work=[[Anandtech]]|date=May 2, 2024|access-date=October 8, 2024|quote=The ATX v3.1 specification was officially launched on 13 September 2023, following the release of the ATX v3.0 in February 2022.}}</ref>

EATX (Extended ATX) is a bigger version of the ATX motherboard with {{convert|12|xx|13|in|mm|0|abbr=on}} dimensions. While some dual CPU socket motherboards have been implemented in ATX, the extra size of EATX makes it the typical form factor for dual socket systems, and with sockets that support four or eight memory channels, for single socket systems with a large number of memory slots.

In 2004, Intel announced the [[BTX (form factor)|BTX]] (Balanced Technology eXtended) standard, intended as a replacement for ATX. While some manufacturers adopted the new standard, Intel discontinued any future development of BTX in 2006. {{As of|2025}}, the ATX design still remains the de facto standard for personal computers.