This PC runs so quiet that even under a full load the PSU (750 G2) is the loudest thing in the system, and this is a quiet PSU. I installed a piece of acoustic foam along the side and front edge. Dropped 2db overall and got rid of that slight air noise you could hear before. Now on, off or full load it pretty much sounds the same.
Quiet 8700k 1080 Ti
This machine was pre-built to sell. With Dual AIOs and custom fan curves controlled by speedfan, it overclocks extremely well and runs extremely quiet. Zero issues with any of these parts and the customer was very satisfied.