Correct graphics card? PRIME B450M-A?

The description speaks of

2nd and 1st Gen AMD Ryzen ™ with Radeon ™ Vega Graphics Processors

1 x PCIe 3.0 / 2.0 x16 (x8 mode) * 1

AMD Athlon ™ with Radeon ™ Vega Graphics Processors

1 x PCIe 3.0 / 2.0 x16 (max at x4 mode)

Use:

4K streaming → Netflix etc.

No, this is a graphics chip integrated in the processor, which is only sufficient for office and multimedia.

At the moment, however, it is difficult to get hold of a graphics card that is not overpriced. Since these graphics chips are currently better suited for office and multimedia. But you can forget about gambling.

Yes, there's no question of gambling.
More to stream or YT

Yes, as I said, the graphics chip is easily sufficient for that.

Ok thanks

With pleasure.

But it has to be mentioned that only Ryzen processors with a "G" (like graphics) on the back also have a graphics chip. A Ryzen 5 3600, for example, has no such graphics chip installed. And without a graphics chip, the screen remains black.