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The most recent ATX motherboard specification is version 2.2. [3] The most recent ATX12V power supply unit specification is ATX 3.0 released in February 2022. [4] [5] [6] EATX (Extended ATX) is a bigger version of the ATX motherboard with 12 × 13 in (305 × 330 mm) dimensions.
Derived from the EEB and ATX specifications. microATX: Intel: 1996 244 × 244 mm (9.6 × 9.6 in) A 20 % shorter variant of the ATX form factor. Compatible with most ATX cases, but has fewer slots than ATX, for a smaller power supply unit. Very popular for desktop and small form factor computers as of 2017. Mini-ATX: AOpen: 2005
According to Gamer's Nexus, E-ATX is not a standard, it is free-for-all marketing thing that generally agrees largest size is 12" x 13". Wikipedia article has inaccuracy referring E-ATX and SSI EEB are not hole compatible which is untrue. SSI-EEB only introduces additional POSSIBLE hole choices to make component placement easier on the motherboard.
ATX: 2.3 2007/03 BIOS Boot Specification: 1.01 [2] 1996/01 BIOS Enhanced Disk Drive Specification ... Version Released American Standard Code for Information Interchange:
The term Mini-ATX was originally used in (now obsolete versions of) Intel's ATX specification, and denoted motherboards with dimensions of 284 x 208 mm (11.2 x 8.2 in.). The two terms refer to different specifications and should not be conflated.
The ATX connector provides multiple wires and power connections for the 3.3 V supply, because it is most sensitive to voltage drop in the supply connections. Another ATX addition was the +5 V SB (standby) rail for providing a small amount of standby power, even when the computer was nominally "off".
The latest pin-out added in revision 3.0 of the COM Express specification (available from www.picmg.org) is Type 7. The Type 7 provides up to four 10 GbE interfaces and up to 32 PCIe lanes, making COM Express 3.0 appropriate for data center, server, and high-bandwidth video applications.
The four mounting holes in a Mini-ITX board line up with four of the holes in ATX-specification motherboards, and the locations of the backplate and expansion slot are the same [2] (though one of the holes used was optional in earlier versions of the ATX spec). Mini-ITX boards can therefore often be used in cases designed for ATX, micro-ATX and ...