ATX Size Guide: How to Choose Right for PCIe 5.0 & Dual-Chamber Builds

The ATX (Advanced Technology eXtended) size standard remains the dominant force in the 2026 PC hardware market, representing approximately 38.5% of all computer case sales. While Small Form Factor (SFF) builds are growing in popularity for home offices, the ATX form factor is essential for high-performance AI and gaming setups due to its superior thermal management and support for 420mm radiators.

Key trends for 2026 include the mainstream adoption of PCIe 5.0 and Wi-Fi 7, alongside a shift toward dual-chamber case designs that optimize airflow for high-wattage components. Despite rising production costs—with PCB materials up by 50% due to AI sector competition—the ATX standard continues to offer the best expansion headroom for enthusiasts and professionals alike.

Detailed market data, consumer comparisons, and current product price ranges can be found in the report below.