ATX motherboards are the most widely adopted form factor for desktop computers, offering an ideal balance of size, expandability, and performance. Measuring 305 × 244 mm, ATX boards are designed to fit mid-tower and full-tower cases, giving users ample space for upgrades. A standard ATX board supports up to seven PCIe expansion slots, allowing for multiple graphics cards, sound cards, and network adapters. Most ATX motherboards provide four or more RAM slots, supporting up to 64GB–256GB of memory depending on the chipset, making them suitable for both gaming and professional workloads. They also feature multiple SATA and M.2 slots for SSD and HDD storage. ATX boards are equipped with comprehensive I/O, including USB 2.0, 3.2, Ethernet, and audio ports, while premium models may include Wi-Fi 6 and advanced audio chipsets. With strong VRM design, ATX motherboards handle overclocking efficiently, providing stable power delivery to CPUs and GPUs. They support high-performance cooling systems, including liquid cooling, making them a favorite among gamers and enthusiasts. Due to their versatility and ability to balance performance with cost, ATX motherboards remain the most popular choice for PC builders looking for a reliable, scalable foundation for their systems.