You're feeling unsure. Let me help clarify things for you.
You're feeling unsure. Let me help clarify things for you.
I understand, though some references suggest it's an ATX board.
ATX size: 305 × 244 mm
E-ATX size: 305 × 330 mm
This board measures 305 x 270 mm (source: gigabyte website) — larger than ATX but shorter than full E-ATX. Likely some mistakenly label it as ATX. I prefer sticking to the official details.
Alternatively: It surpasses the ATX dimension limits, making classification as ATX incorrect. Its size fits within E-ATX specs, so labeling it E-ATX is appropriate, as it should fit in any E-ATX case (or bigger).
Wikipedia on computer form factor
It describes the design and physical characteristics of computers, focusing on their size and shape.