9347359 :
It depends
https://www.youtube.com/watch?v=1E1JCBtouK0
Uh, that's a different case so what's the POINT of this?
There are different types of "ATX" cases and they support up to "E-ATX".
If it's E-ATX it supports E-ATX, ATX, micro-ATX and mini-ITX.
However, if it's a "mini-ITX" case it doesn't support the larger boards.
When you label a case that simply means it supports that type of board as well as the smaller ones that are compatible.