Hi, it’s me again.
So after a lot of testing with different computers, power outlets, monitors, cables and also other apartments ;), i know it’s definitely a problem of the card itself. I had the same errors on every scenario…
There is also no damaged capacitor from what i can see on the card, meaning nothing is bloated or something. 
Do you have any further ideas what the problem causes? 
Last option i want to try is the latest bios.
So could you please send me the latest bioses (bios 1 and 2) or tell me where i can get it?