I always swapped out hardware 1 by 1. (changed out EVERY single hard ware 1 by 1 and tested what the problem was.) This didnt fix my Issue with huge desync. So I followed Texre's advice and build a completely new system at once. So I bought an gaming laptop and oh boy oh boy, I never in my entire life had so smooth and good gameplay. My audio is completely new, its like I actually know where the sound comes from now, which never was the case before. I have REALLY smooth gameplay now, no floaty mouse, no desync, players are 1 to 1 there where they are shown. Oh boy, I spend a few months trying out what tf the issue was and it was swapping out hardware 1 by 1. I dont get it though, could it be that my old psu was faulty and destroyed my hardware? Or could it be that windows now detects my system as a complete other system and therefore have no problems anymore?
Im certain ill never have an Issue with desync again, as it came with some other issues which was in my case weird audio, which instantly got completely fixed by buying a whole new system at once.
Again thanks TEXRE, I could trust you...
And btw my Issue was to a high degree, a very high degree, Desync, bad Audio, Floaty mouse was permanent and very very very blatant. It was absolutely impossible to hit anyone in FPS games, PVP minecraft ...