Thx all for your replies!
I think I'll just do it the chill way and watch GPU prices the next few months. So I can build in a second GPU
in my gaming PC first with a new PSU and then try to maintain a more casual setup so I won't get charged with insane
electrical costs if they find out and charge me the extra I used.
Also I calculate the electrical costs of my city and try to assume what the company pays for it, so I know that I can afford it if they ever come to my appartement and want me to pay what I used extra.
For 1000 euros you can buy RX5700 or RTX 3060ti.
if you find these cards on sale. If I were you, I would buy 3060ti, because you have 2080S
You will need a 700 watt power supply for 2 video cards and the unit must have enough power connectors to connect video cards.
You will need a raiser to plug in your video card and install it near your computer.
Installing two video cards in the computer case will cause them to overheat during mining.
The total consumption from the wall will be 450-500 watts.
Will your socket withstand such a constant load? Ideally, it should have a ceramic box