There is such a configuration: MSI A320M PRO-M2 V2 + AMD Ryzen 5 1400 BOX and there isn't any separate video card. When the PC is switched on, the monitor shows nothing. The MSI tech support said:
There is no GPU in the CPU Ryzen 5 1400, and the onboard VGA port cannot work with
this CPU. It is necessary to install a PCIe graphics card.
And added that
Whether it is Intel motherboard or AMD motherboard, the onboard integrated
GPU is in the CPU, not in motherboard. The motherboard only provides the
display port. There is no GPU in the Ryzen Summit Ridge CPU; only Raven
Ridge and Bristol Ridge CPUs support a GPU.
What I don't understand is that I have another configuration, ASRock 960GC-GS FX + AMD Phenom(tm) II X4 810. Again there is no separate video card. As I found out, AMD Phenom(tm) II X4 810 doesn't have any GPU. But the video works and this question I post using this configuration. How can this be explained?