Motherboard atx detail

ATX motherboard: the standard defining modern desktop computer architecture, with expansion slots and power connectors.

About this subject

The ATX (Advanced Technology Extended) motherboard is a form factor introduced by Intel in 1995 to replace the older AT standard. Its key innovation was placing the processor and memory slots parallel to expansion slots, improving airflow and cooling. The main 20-pin (later 24-pin) power connector became an industry reference.

In a close-up of an ATX motherboard, essential components include the CPU socket (e.g., LGA 1200 or AM4), DIMM slots for RAM, the chipset (now integrating northbridge and southbridge), and PCI Express slots for graphics cards and peripherals. The VRM (Voltage Regulator Module) near the socket is critical for stable CPU voltage delivery.

Long exposure photography highlights traces and circuits, but actual motherboards use multiple copper layers (typically 4 to 6) to interconnect billions of transistors. Heat dissipation is managed by passive heatsinks on VRMs and chipsets.

Interestingly, the ATX standard defines dimensions of 305 mm x 244 mm (12 x 9.6 inches), but variations like microATX (244 x 244 mm) and Mini-ITX (170 x 170 mm) exist. Form factor choice directly impacts case and power supply compatibility.

Frequently Asked Questions

What does ATX stand for in motherboards?

ATX stands for Advanced Technology Extended, a motherboard form factor standard introduced by Intel in 1995 to better organize components, improve cooling, and standardize power and I/O connections.

What are the main connectors on an ATX motherboard?

Main connectors include the CPU socket, RAM DIMM slots, PCI Express expansion slots, SATA storage connectors, the main 24-pin power connector, and an auxiliary 4 or 8-pin CPU power connector.

What is the difference between ATX, microATX, and Mini-ITX?

Standard ATX measures 305 x 244 mm, microATX is 244 x 244 mm (fewer expansion slots), and Mini-ITX is 170 x 170 mm (single PCIe slot). Size affects component count and case compatibility.