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.

The Flex ATX is a more compact version of the micro-ATX and has a maximum size of 9 inches x 7.5 inches (229 mm x 191 mm). Most of the cheapest H610 offerings are based on the Flex ATX form factor. Ad ...

For example: The ASUS TUF Gaming B650-Plus WiFi ($200) is a full-size ATX motherboard for the AMD AM5 platform. It boasts four RAM slots, two M.2 slots, and a PCIe 5.0 slot.

When it comes down to using a Micro-ATX motherboard for gaming, you must consider that the size is 244 x 244mm or 9.6” x 9.6”, while a standard ATX comes in at 305×244 mm or 12.0” x 9.6”.

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, crappy home servers...Flex-ATX: No ...