Motherboards - CompTIA A+ 220-1201 - 3.5

Motherboard Form Factors

This CompTIA A+ lesson explains how to choose a motherboard form factor based on a computer’s size and intended use. Desktop and compact systems contain similar core components—such as a CPU, memory, storage, and network connections—but their motherboards differ in footprint, layout, expandability, power connections, and cooling needs. Larger boards generally have room for more components.

ATX

ATX is a long-established standard dating to 1995. Earlier ATX motherboards used a 20-pin main power connector; newer versions use a 24-pin connector. The example shown has four memory slots and multiple expansion slots.

MicroATX

MicroATX is smaller than ATX and has a similar layout. It uses the same mounting points and power connectors as a full-size ATX board, but its reduced space may mean fewer resources. The example shown has two memory slots and one expansion slot.

Mini-ITX

Mini-ITX is a very small form factor suited to tight spaces, such as a media-center setup or a computer dedicated to one task. It uses the same mounting screw points as a traditional ATX board, so it can be installed in an ATX case.

Choosing a Form Factor

Consider the following when selecting a motherboard:

• Physical fit
• Component layout and expansion needs
• Power compatibility
• Whether the cooling system can handle the heat generated

The best choice depends on the use case. For example, a compact media device may call for a different motherboard than a desktop intended for video editing.

Lesson Focus and Source

This instructional overview covers CompTIA A+ objective 3.5, comparing motherboard types and their practical trade-offs. It is not a product review. The lesson is presented by Professor Messer.