By throwing lots of money at the problem. With the Nofan CPU cooler, my PC is pretty quiet but the constant low noise, not to mention the GPU sounding like a dishwasher really gets to me. Maybe it's my tinnitus but I had to do something. This was my setup Then I added my Acer Nitro 4K and needed a long video cable. I couldn't get a 5m Displayport 1.4 copper cable so forked out £200 for a fibre-optic cable: That worked very nicely, so I decided to go the whole hog and move the PC into the cupboard in the corner so I got two more fibre video cables, a 5m active USB 3 cable, a 5m USB 2 cable, a 5m TOSLINK cable, plus sundry power cables and protectors: There's about £700 of cables there. I also purchased some noise-absorbent foam and some cable tidy boxes.