Motherboard Sizes: Understanding E-ATX, ATX, mATX, and mini-ITX When building a PC, choosing the right motherboard size is crucial for ensuring compatibility, upgradability, and performance.

So, in increasing size (please correct me where I am wrong):Mini-ITX: 17cm x 17cm. Very small, quiet, cheap, and underpowered. For MP3 players, firewalls ...

The most important thing about an ATX motherboard is its size. ATX boards measure 305 by 244 millimeters, and PC parts and case sizes have largely standardized around them.

Over the years, a few motherboard sizes, typically called “form factors,” have dominated the PC market. Three are today by far the most common: ATX, MicroATX, and Mini-ITX.

If you want to build your own PC, you'll need to decide which motherboard will serve as the foundation of your machine. Here's how the brands stack up.

Step 2: No matter the path you took to get here, you're now in the System Information section of Windows. To find out your motherboard model, look for the following: Baseboard Manufacturer and ...