Motherboard atx detail

The ATX form factor, introduced by Intel in 1995, standardized motherboard layout and connections, defining the architecture of modern personal computers.

About this subject

The ATX motherboard is the dominant standard for desktop computers for decades. Developed by Intel as a replacement for the AT form factor, the ATX specification brought significant improvements: the CPU was repositioned away from expansion slots, improving airflow and allowing more efficient coolers. Additionally, the power connector was standardized into a single 20-pin (later 24-pin) connector, simplifying installation.

Typical components on an ATX motherboard include the CPU socket, RAM slots (usually DIMM), chipset (northbridge and southbridge, now integrated), PCIe expansion slots, SATA connectors for storage, USB ports, and a standardized rear I/O panel. The ATX layout defines mounting hole positions and board size: 12 × 9.6 inches, fitting into compatible cases.

Over the years, variants such as Micro-ATX and Mini-ITX have emerged, maintaining partial compatibility with the ATX form factor. The ATX motherboard supports high-performance processors, multiple GPUs, and large amounts of RAM, making it the choice for gamers and workstations. The current generation uses 8-pin EPS12V power connectors for the CPU and supports PCIe 5.0, USB 3.2 Gen 2, and DDR5 RAM.

Interestingly, the ATX standard also influenced power supplies, which adopted a specific shape and connectors, such as the main 24-pin connector and the auxiliary 4+4-pin for the processor. Today, most cases and power supplies follow ATX guidelines, ensuring interoperability.

Frequently Asked Questions

What is the ATX form factor?

ATX (Advanced Technology Extended) is a motherboard and power supply standard developed by Intel in 1995, defining dimensions, mounting positions, and connectors for desktop computers.

What are the main advantages of ATX over the AT form factor?

ATX improved airflow by repositioning the CPU, simplified cabling with a single power connector, and standardized the rear I/O panel, making assembly and cooling easier.

What components are found on an ATX motherboard?

A typical ATX motherboard includes a CPU socket, RAM DIMM slots, chipset, PCIe expansion slots, SATA connectors, USB ports, audio panel, and power connectors (24-pin main and 4/8-pin CPU).