atx motherboard expansion slots
Mua MSI B550-A PRO (AMD AM4, DDR4, M.2, USB 3.2 Gen 2, HDMI, ATX ...
Expansion slots, M.2 support, and networking options also play crucial roles in tailoring a motherboard to specific needs.
ATX & Micro ATX Motherboard
ATX Micro ATX Motherboard
GIGABYTE AERO Z690 Motherboards - aorus.com
Extended ATX or EATX is the largest motherboard form factor, and while it is very similar to ATX in terms of functionality, EATX motherboards are wider and have more PCIe expansion slots.
ATX board owners: what are you filling all those expansion ...
ATX is the most common motherboard design. [2] Other standards for smaller boards (including microATX, FlexATX, nano-ITX, and mini-ITX) usually keep the basic rear layout but reduce the size of the board and the number of expansion slots.