The WIRED Guide to Motherboard Sizes
Briefly

Motherboards utilize the ATX standard, which dictates size, port location, and power supply compatibility across different manufacturers, making assembly easier and more intuitive.
The standard ATX motherboard measures 305 x 244 mm, allowing ample space for various components such as RAM slots, PCIe cards, and M.2 slots, streamlining PC building.
Read at WIRED
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