Look at what's being offered in this area and it speaks for itself.
There is silence for a price. What's stopping you?
About 5-6 years ago I built a high powered gaming rig with the Zalman Reserator fanless water cooling system. I hooked up a second radiator in to the pipeline, but the best part was that I only needed a couple of large fans to keep air flowing through the case, no cpu fan or GPU fan, which enabled me to keep my high powered rig, practically silent.
I have done a lot of travelling between now and then, so had to begin using a laptop, but with a little stability apparent I may be able to invest in a new gaming computer.
My question is, do you guys think it is still possible to build a silent running gaming rig with a fanless water cooling system, or has technology surpassed this method of cooling?