Hello again,
so yes i think the gpu is the issue, but not the gpu exactly. The problems occured since i build my PC most the time but it didnt really bother me that much till now, where i fully need my hardware. But listen, a friend of mine tried something yesterday on my pc. He ran FurMark to stresstest. In that test my GPU was at 100% usage, my Ram way over 50% and my CPU was at 70-80%. So that would be perfect right? So he did another cpu test at the same time and then things got awkward. The GPU Usage fell from 100 to 40 in one second and the CPU usage was 100%. So he thinks that probably smth is up with my PSU and we will test today. Sincerly Jakob