Wanted a silent server system for various things; fan noise bothers me, and in trying to rid heat also creates it.
So Monsterlabo case, its all passive heatsink that sandwiches onto your CPU and GPU.
I wanted a silent fanless PSU but they were hard to get here without huge shipping fees...so I picked up and over spec'd wattage PSU for the system as the fan in it only comes on at 30% watt use.
SSDs for silent operation, since harddrive access makes noise.
CPU I5-7400, 16 GB RAM
You never know its on. CPU runs around 35 C, will hit 49 C when processing a video render or other labour task.