My question would be if this PC is good enough to play Fortnite and Overwtach
The link https://www.ebay-kleinanzeigen.de/s-anzeige/apex-fortnite-gaming-pc-i5-gtx-970/1066100519-228-1279
Yes he is.
Despite the old hardware, it also has an acceptable price / performance ratio (which is probably relative to used PCs)
Yes, that certainly does that, but is a bit expensive for a used pc. For 500 euro, you already get a new PC with NEN Ryzen 3 1200 (about as strong / stronger than i5 3570k) and ne RX 570 8gb (equally strong but mostly stronger than GTX 970 and 4.5gb Vram more!)
In addition, you can also upgrade the PC to Zen2, Zen2+, Zen3 …
Yes, these two games will make the PC easy in very high settings with 60 FPS.
But other CPU-heavy games like Battlefield would only run at about 30-40 FPS, because the i5-3570 is quite old and slow with only 4 threads.
The disadvantage: You can't upgrade the CPU, because then you would have to buy a new motherboard and then new DDR4 RAM.
I think 420 EUR are too much, but so 350 EUR are appropriate. The PC is quite well equipped except for the old CPU.
For https://hardwarerat.de/...arerat-500 you get a new equivalent fast PC, but has the advantage that you can easily upgrade the CPU.
The seller writes a bit of nonsense, but his offer is basically not bad.
On which graphics settings could that work?
Can you recommend a PC for me so the budget of 400 euro has?
No 400 EUR are unfortunately too little for a meaningful new gamer PC. Then take the used car and trade at 380 EUR. Say that for 520 you already get a mint PC, which you can upgrade later super. The link I have you linked above.
The 1200 and the 570 are both slightly weaker than the parts proposed in the proposal