Motherboard sizes in 2025: learn how to pick between ATX vs microATX vs Mini-ITX and more

When you start to build a PC, one of the first decisions you’ll face is choosing the right motherboard size. Over the years, motherboard form factors have evolved to offer a range of options tailored to various needs, from powerful gaming rigs to compact home theater machines. Here, we’ll answer common questions about motherboard sizes and explore the main options available today so that you can make an informed choice.

Why does motherboard size matter?

First and foremost, motherboard size matters due to parts compatibility. An extra-large EATX motherboard won’t even fit inside the confines of a compact microATX chassis. And while you can install a petite Mini-ITX board into a large chassis, you’ll be missing out on the chief advantage of the smaller board size…

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