This is not a true mini-dtx motherboard. It is mini itx that is extended. Mini-dtx has two pcie slots.
They removed the second pci slot for a sound card, it's still DTX form factor.
ASUS TUF Gaming Motherboards|Motherboards|ASUS USA
ASUS TUF Gaming motherboards distill essential elements of the latest Intel® platform and combine them with game-ready features and proven durability. Engineered with military-grade components, an upgraded power solution and a comprehensive set of cooling options, each ASUS TUF Gaming...
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"AMD AM4 X570 Mini-DTX enthusiast gaming motherboard..."