Something you might want to check out:
Die besten Hardware Deals & Schnäppchen. Unglaubliche Preise und Gutscheine für Gaming PCs, Laptops, Grafikkarten, SSDs, CPUs und vieles mehr!
www.hardwaredealz.com
Bei Mindfactory finden Sie Gaming PCs von vielen Herstellermarken zum günstigsten Preis ?Sonderangebote im MindStar | Zertifiziertes Shopportal | Hier kaufen!
www.mindfactory.de
The problem with ready to use computers is that you always pay a lot on top. The intel i7 8700 may be better than the i5 9400F. But better check some benchmarks.
Where do you have the data tables from? Is Windows 10, mouse, keyboard and screen part of the price?
If you want or can build it on your own, take a look at this setup. Made by the person who did my setup too. Depends on your budget and knowledge:
Bei Mindfactory.de finden Sie günstige Hardware, Software, Notebooks, Computer, Tablets, Smartphones, Spielekonsolen und vieles mehr.
www.mindfactory.de
Edit: Forgot a SSD in there. I personally have 1 TB SSD. Choose whatever fits your budget/need.
However no guarantee for anything from my side.
Also depends on what your son plays. Games like BF4 and even BF5 are working with a NVIDIA 1060 (BF5 only full hd and average graphics). But with newer games like the new COD, BF5 and so on the specs are going high.