ATX

The industry-standard motherboard form factor defining power delivery, mounting geometry, and component layout for modern desktop computing.

Intel introduced the ATX (Advanced Technology eXtended) specification in 1995 to fix the cooling and cabling flaws of the aging AT design. It standardizes the 12 x 9.6-inch board footprint and the 24-pin power connector used by millions of systems today. By rotating the processor and memory 90 degrees, ATX allows for direct airflow from the intake fans across high-heat components. This layout ensures compatibility across thousands of chassis and power supply vendors (like Corsair and Seasonic) while supporting up to seven expansion slots for high-performance GPUs and PCIe devices.

https://www.intel.com/content/www/us/en/design/resource-design-center.html