The form factor is specified as ATX, so it should have 305mm space since ATX is standardised (as far as I know).
Why does the manufacturer's website specify a maximum of 272mm for the motherboard?

Question

The form factor is specified as ATX, so it should have 305mm space since ATX is standardised (as far as I know).
Why does the manufacturer's website specify a maximum of 272mm for the motherboard?

Accepted Answer

Yes, that is correct. However, the 272mm stands for the width and not the height. So that would be a maximum of 305 x 272, which corresponds to an E-ATX size. However, E-ATX can have different widths. 

Here are two examples (see product dimensions under specifications):
[ASUS ROG STRIX X399-E GAMING (TR4, AMD X399, E-ATX)](https://www.digitec.ch/de/s1/product/asus-rog-strix-x399-e-gaming-tr4-amd-x399-e-atx-mainboard-6448415) 
[ASUS ROG ZENITH EXTREME (TR4, AMD X399, E-ATX)](https://www.digitec.ch/de/s1/product/asus-rog-zenith-extreme-tr4-amd-x399-e-atx-mainboard-6418483)

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Question about Corsair Crystal 460X RGB

The form factor is specified as ATX, so it should have 305mm space since ATX is standardised (as far as I know). Why does the manufacturer's website specify a maximum of 272mm for the motherboard?