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PC cases are built around motherboard sizes. The size you pick changes cooling, expansion and price.
Last updated: October 30, 2026.
ATX Cases
Most room, most expansion slots and easiest cooling. See our best PC cases.
Micro-ATX Cases
Smaller than ATX with fewer slots. See our micro-ATX cases.
Mini-ITX Cases
The smallest, but harder to build in. See our small form factor cases.
Which Should You Pick?
Choose ATX for ease, micro-ATX for compact desks and mini-ITX only if space is critical.
Can an ATX board fit a micro-ATX case?
No; boards must fit the case.
Is mini-ITX more expensive?
Often, for the case and board.
Bottom Line
ATX is easiest, micro-ATX is a middle path and mini-ITX is for tight spaces.
