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(hardware, standard)
An open PC motherboard specification by Intel.

ATX is a development of the Baby AT specification with the motherboard rotated 90 degrees in the chassis. The CPU and SIMM sockets have been relocated away from the expansion card slots meaning that all the slots support full-length cards. More I/O functions are integrated on the motherboard. As the longer edge of the board is now at the back of the chassis, there is more space for connectors; also, the I/O opening on the back panel of the chassis has been defined as double the previous height, allowing vendors to add extra on-board I/O functions over and above the standard.

Most Pentium Pro boards use this form factor.

As well as the motherboard size, layout, and placement, the ATX specification also includes requirements for power supply and fan specification and location.

The full size ATX board measures 305mm wide by 244mm deep. There is also a Mini-ATX form factor, 284mm by 208mm.
References in periodicals archive ?
An ATX power supply accepts 110V-240V AC, drawing under 150W and typically around 100W.
Corsair has introduced the AX1500i Digital ATX power supply.
Bengaluru, June 28 -- Corsair(R), a worldwide designer and supplier of high-performance components to the PC gaming hardware market, today announced the Corsair AX1200i Digital ATX Power Supply, the world's most advanced modular power supply for PC gamers and enthusiasts.
The unit is powered by an included 12V DC to ATX power supply with no fans.
The PXIS-2630 is equipped with industrial grade 400W ATX power supply to provide reliable and cost effective power to the system.
This 280mm x 200mm x 115mm chassis features a 150w ATX power supply and space to incorporate one or two PC/ 104, PC/104-Plus or PCI-104 expansion modules.
Power is provided by an embedded 150 W ATX power supply.
Four shock-isolated drive bays accept any combination of hard drives, removable media, DVD, CD-ROM, CDRW or other storage devices, and the FieldGo R9 accepts up to 2GB memory, has one parallel, two serial and two USB ports, a 300W 440Hz 110/220 VAC ATX power supply and is available with an optional UPS PCI card.
The ZT Systems R1801e uses an industry standard 1U chassis, ATX power supply and SATA drive bank, so it fits easily into existing development lab and datacenter environments.
Skill Ripjaws V series 32GB (2 x 16GB) DDR4-3200 memory, Asus GeForce GTX 980 Ti 6GB STRIX video card, Phanteks Enthoo Pro ATX full tower case,EVGA 1000W 80+ gold certified fully-modular ATX power supply, LG WH14NS40 Blu-Ray/DVD/CD writer, corsair air series AF140 quiet edition 67.
86GHz fan less embedded system with 5-wire resistive type touch screen, rich I/O ports, 130W ATX power supply, and is all protected with IP65 rated stainless steel front bezel.
Tenders are invited for Supply Of Standard Atx Power Supply Unit