Measuring in at 305 x 244 mm (12 x 9.6 inches), this size of motherboard has plenty of room for four or more RAM slots, multiple PCIe cards at several lengths, and two to four M.2 slots.

There are four motherboard sizes available in 2025 from major manufacturers such as Asus, Gigabyte, and MSI, among others. These are Mini-ITX , MicroATX , ATX , and E-ATX .

With motherboard sizes influencing the overall esthetics and expansion options of a PC, choosing the best parts for a proper gaming rig that is perfectly sized yet powerful is crucial. Different ...

We've outlined the four different motherboard sizes available in 2025, their use cases, price differences, and varying features as they stand right now.