What is the power of this PC?

My brother wants to buy a "gaming" PC here your components

Processor: AMD Ryzen 3 2200G (4x 3.5GHz / 3.7 Turbo)

Radiator: Standard box cooler

Motherboard: MSI B450M PRO-VDH

Ram: 16GB (2x8GB) GSkill DDR4 3000MHz AEGIS

Graphics card: none

Power supply: 300W be quiet! Pure Power 11

The pc should be overclocked.

Fps in games: Minecraft, Fortnite also adds benchmark results.

Is the power supply enough to pay off?

There's currently not enough money for a dedicated graphics card because of the upgrade question

Power adapter is not enough for upgrades. Also, you can't build a gaming PC without graphics card (but 16GB RAM?). So that's not a good config

Yes, without graphics card it fits.

Sorry, question misunderstood. Conditionally, for a small card ala RX 560, or GTX 1050ti it is enough, but not more.

You can't build a gaming PC without a graphics card. The graphics card is one of the most important parts of a gaming PC and if that is missing then he will hardly be able to play a game on it!