flex ATX above that is the micro ATX
Micro ATX
It is an ATX motherboard. But even though it is an ATX size it is a company specific motherboard, and is not compatible with standard ATX cases.
Some motherboard form factors (from smallest to largest in physical size) are: -Mini ITX -Micro ATX -ATX -E ATX
A micro ATX motherboard is simply a small version of the more popular ATX motherboard. It has less room for expansion (graphics, sound and network card.
Yes, if it is an ATX motherboard. The motherboard specifications should say specifically if it is ATX, mini ATX, BTX, ITX, etc. Most motherboards are ATX.
Mini-ITX. It is much smaller than ATX variants.
Two common types of motherboard are ATX and Micro-ATX. An ATX motherboard is much larger and allows for additional hardware to be installed.
the ATX Form Factor
Asus is simply a manufacturer that makes atx and non-atx motherboards. Whether a motherboard is ATX or not is specific to that single model.
No. The PCI slots on the motherboard will not line up properly with the chassis and most chassis that are made for ATX have screw holes to accomodate atx and mini atx
usually any motherboard that has a form factor above mini or micro atx (atx, extended atx, super atx) will have atleast 4 if not more expansion slots available by default and normally an atx (and possibly a extended atx) motherboard should fit in a full tower case (a super atx motherboard will more than likely need a super tower)
No. All ATX cases are capable of accepting a microATX or FlexATX motherboard as well.