A Are all motherboards the same size or universal? Posted on June 8, 2020 No, not all motherboards are the same size. Motherboards are categorized primarily by size (form factor), such as: mini-ITX, micro-ATX, ATX, E-ATX, etc. Depending on the size of your computer case, smaller/larger form factors may be compatible. Did you find this FAQ helpful? 0 0 Share facebook twitter Back to Top