How much ghz does a laptop have to have to be able to gamble with it? And or also which intel i5?
The built-in graphics card is much more relevant and which games should run on it.
You can't say that in general. I have a better idea. You tell us what you want to play and we will tell you what you need.
Gta server
Still depends on the graphics card.
If you have a really strong i9 but not a good graphics card, you will have problems. You just need a good enough processor for the graphics card.
Just a GTA server?
No game, nothing else?
Yes only gta server with teamspeak and, discord
You can use an i5 10XXX for this.
10xx?
Yes all from the 10,000s
so something like the 1135G7.
Can I find one used for 150 euro?
Definitely not, you will only find 2000 or 3000 models from ~ 2012 at most.
What about this
i5 - 5200 2x 2.7Ghz Turbo + 2x 2.2Ghz Hyper
8gb ddr3
1TB SSHD
Ne is not good. It's just a dual core.