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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
ATX: 2.3 2007/03 BIOS Boot Specification: 1.01 [2] 1996/01 BIOS Enhanced Disk Drive Specification (INT 13H) 3.0 [3] 1998/04/20 Bluetooth: 5.0 2010/06/30 Boot Integrity Services API 1.0 [4] 1998/12/28 BTX Chassis Design Guidelines 1.1 2007/02 BTX Interface Specification 1.0b 2005/07 BTX System Design Guide 1.1 2007/02/20 Chassis Air Guide (CAG ...
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 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.
Version 2.1 of the ATX specification states that the length of standoffs needs to be at least 0.25 inches (6.4 mm), with their cross sections fitting within 0.40 by 0.40 inches (10 mm × 10 mm) square areas centered around each mounting hole on ATX motherboards. [4]
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 ...
In computer design, microATX (sometimes referred to as μATX, uATX [1] or mATX) [2] is a standard motherboard form factor introduced in December 1997. [3] The maximum size of a microATX motherboard is 9.6 × 9.6 in (244 × 244 mm).