The power supply is built in the ATX form factor and fits in cases that support an ATX power supply.
Normally this is stated in the technical details. In the Antec Cube Razer, for example, it is missing. But I quickly researched it on the internet and yes, this power supply would fit. The case supports ATX power supplies. But check this with other cases in Mini-ITX sizes. These could support the smaller SFX form factor.