the power supply fits into a mATX case. The exact case is the Asus Prime AP 201.
https://www.digitec.ch/de/s1/product/asus-prime-ap201-mini-itx-matx-pc-gehaeuse-22130747

If no, does anyone know of a good one around 800watt. (i713700k, 4070ti) Price is not so important.

Question

the power supply fits into a mATX case. The exact case is the Asus Prime AP 201. 
https://www.digitec.ch/de/s1/product/asus-prime-ap201-mini-itx-matx-pc-gehaeuse-22130747

If no, does anyone know of a good one around 800watt. (i713700k, 4070ti) Price is not so important.

Answer

Ja, das Netzteil ist mit dem Asus Ap201 kompatibel. Das Gehäuse ist mit Netzteilen zwischen 140-180 mm Länge kompatibel, dieses hier ist 175 mm lang.

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Question about be quiet! Dark Power 13 850 Watt

the power supply fits into a mATX case. The exact case is the Asus Prime AP 201. https://www.digitec.ch/de/s1/product/asus-prime-ap201-mini-itx-matx-pc-gehaeuse-22130747 If no, does anyone know of a good one around 800watt. (i713700k, 4070ti) Price is not so important.