I just got my pc running, its absolutely noisefree!
No, I didn't invest 100s of euros for passive cooling solutions that make the system unstable, and I didn't invest in any watercooling shit that regularly needs to be maintained. What did I do?
I just put my PC far far away from me!
I just bought some 10 m cables for PS/2, USB, VGA ...
The PC is now in the roof, I'm sitting in my room ...
And I don't hear anything ...
The cool thing at first, you think you hear something ...
cuz you are so used to the pc noise ...
but there is nothing

well the only problem I had is that my DVI cable is not functioning,
I need to buy a DVI-Repeater to make it possible, but that thing costs 100 Euro, so I now use a normal VGA-Cable ... Maybe some day I upgrade to DVI but not now ... btw, if you want to do that too, make sure you buy usb cables with repeater included (doesn't cos much one 5 m lenght cable was 3 Euro for me, so 10 6 Euro in total, you can go up to 25 m).

And I only invested 30 Euro for the cables ...
And I could even double the distance if I wanted ...