atx expansion slots - ATX - Wikipedia slot big win 888

ATX is the most common motherboard design. [1] 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.

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.

Expansion slots: The motherboard provides expansion slots for adding additional components such as graphics cards, sound cards, and network adapters.