I chose the Ryzen7 2700X. I assumed that the MB has a graphics chip (because of the HDMI connection). I will see what is the more favourable solution for me. Thanks for your answer (and light in the dark).

The mainboard itself does not have a graphics chip. The HDMI output only works with compatible CPUs that also have an integrated graphics chip. Otherwise you need an additional graphics card if you do not want to change the processor. However, this then has its own video outputs.

PS: Which CPU do you use?