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What is a small PC case called?

Small form factor or SFF cases are custom cases that are designed to minimize the spatial volume of a desktop computer. The size of the motherboard is often called the Form Factor.

What sizes are PC cases?

There are three major case sizes: Full tower, mid-tower, and mini-ITX. Full-tower and mid-tower cases both fit standard ATX motherboards—by far the most common motherboard size out there. Both can also fit smaller micro-ATX motherboards.