2020age:
https://www.appsloaded.com
Choosing a Motherboard

Two fundamental characteristics determine whether a motherboard is suitable for upgrading a particular system:
Form factor

The form factor of a motherboard defines its physical size, mounting hole locations, and other factors that determine whether the motherboard fits a particular case. The vast majority of computers made since 1995 use either the ATX form factor, also called full ATX, or the microATX form factor, also called ATX. A microATX motherboard fits a microATX case or an ATX case; an ATX motherboard fits only an ATX case. Figure 4-2 shows a typical microATX motherboard on the left, with a larger ATX motherboard on the right.