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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 ?
Upgrade and Optimize: A sleek and refined black chassis that adheres to microATX standards with a tool-less access to the interior, and tool-less removal of up to two 3.5 drives; full-length graphics card support; and room for an industry-standard ATX power supply. Enhance online gaming with OMEN Command Center Network Booster functions to set network task prioritization and utilize two simultaneous data streams.
An ATX power supply accepts 110V-240V AC, drawing under 150W and typically around 100W.
Corsair has introduced the AX1500i Digital ATX power supply. The PSU's digitally-controlled circuitry delivers 1500 watts of ultra-stable power with efficiency that goes beyond 80 PLUS Platinum, making the AX1500i the most technologically advanced, energy efficient, and customizable power supply available for extreme PC enthusiasts.
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. Both front and rear ground clips provide for proper grounding.
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.
Ddr4 4gb memory module, The cpu cooler is compatible with sockets lga 1150, 1151, 1155 and 1156, Dissipating power not less than 65 w, The atx midi-tower package is compatible with the motherboards micro-atx, Mini-atx, Standard-atx with a power supply of at least 450 watts, Color black, Af-am usb extension cable, Not less than 1.8 m, Atx power supply is not less than 450 w
Includes G.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 67.8 CFM 14mm fan.
The price competitive FPC7915N features an Atom D2550 1.86GHz 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.