Guide to Motherboard Sizes: Which One Should You Choose in 2025?
Not all motherboards are the same.
When building a new computer, choosing the motherboard is essential, as it acts as the base component that connects all the parts of the system. However, there is no universal model that fits all cases in 2025. There are four motherboard sizes available, each with its own advantages and disadvantages, designed for different uses. Therefore, it is crucial to know the dimensions, approximate prices, and the compatible sockets with some of the best processors on the market. Compatibility will be a critical factor, especially when considering cutting-edge components like the best DDR5 RAM, top-tier graphics cards, and other PCIe 5.0 components.
The motherboard sizes available in the market in 2025, manufactured by brands like Asus, Gigabyte, and MSI, are Mini-ITX, MicroATX, ATX, and E-ATX. As their names indicate, the smaller models are Mini-ITX and MicroATX, with dimensions of 6.7 x 6.7 inches and 9.6 x 9.6 inches, respectively. The ATX size is the most common, measuring 12 x 9.6 inches. For those requiring more space for additional components, the E-ATX (Extended ATX) offers an area of 12 x 13 inches. The size difference between Mini-ITX and MicroATX is quite noticeable, while the distinction between ATX and E-ATX is more subtle, generally with the latter offering more space on the right side.
Both Mini-ITX and MicroATX are ideal for small form factor (SFF) configurations in work or gaming computers, particularly in low-profile office environments or console-sized rigs for the living room. However, using smaller sizes means there will be fewer PCIe lanes available for connecting components, which could result in a tighter building process. This also implies limited space for some of the best CPU coolers and reduced airflow overall, which is a key aspect to consider before making an investment. In comparison, Mini-ITX is approximately two-thirds the size of an ATX board. Although historically designed for low power consumption, in 2025, some manufacturers are targeting gamers and demanding users in this smaller category, although this typically comes at an additional cost.
When comparing Mini-ITX to MicroATX, it is noted that the former tends to be more expensive for SFF machine builds. This is reflected in the current prices of popular models from recognized manufacturers, where Socket AM5 options in Mini-ITX format are priced higher. For example, the ASRock A620I Lightning Wi-Fi costs $139.99, the Gigabyte B850I Aorus Pro $279.99, and the MSI MPG B650I Edge WiFi $299.99. In contrast, MicroATX options are more affordable, generally under $200, as seen with the ASRock B650M Pro RS at $139.99, the MSI Pro B650M-A Wi-Fi at $159.99, and the Gigabyte B850M Gaming X Wi-Fi 6E at $179.99.
Another significant difference between these two sizes is the number of ports and connections available. Mini-ITX boards, being more compact, generally offer only one PCIe x16 slot for the graphics card and up to two M.2 SSD ports. Depending on the manufacturer, there may be only two RAM slots instead of the four typically offered by MicroATX, which also commonly features more options in its rear I/O, thanks to having 43% more space.
Regarding ATX and E-ATX, although they may seem similar, the additional 35% space of E-ATX can be crucial depending on the hardware you plan to use. While ATX boards usually have up to four PCIe x16 ports and four RAM slots, E-ATX can expand these figures to eight in each category. However, a downside of E-ATX is its higher price and more limited availability. For instance, popular models like the ASRock X670E Taichi sell for $449.99 and the MSI MEG X670E ACE for $499.99, while their ATX counterparts, like the ASRock X670E Steel Legend, are much more affordable at $259.99.
Deciding which motherboard to buy among the four options available in 2025 involves considering several factors, including the chipset. The choice between AMD or Intel, as well as the decision to invest in a new socket instead of an older one, are also elements that impact the decision. Mini-ITX boards are more expensive due to their compact design, while MicroATX offers more economical options that may not have the same features. ATX is the most common and accessible choice, but for advanced users requiring versatility, E-ATX may be the right option, especially in server builds or dedicated workstations. Compatibility is the most critical factor to take into account.
