I don't personally run a fanless build... I use the design I mentioned at the end of my post, liquid cooling with almost silent fans (Noctua brand, like you lin

I don't personally run a fanless build... I use the design I mentioned at the end of my post, liquid cooling with almost silent fans (Noctua brand, like you linked). The defining feature of a fanless build really is cost. It's hard to build a machine that will stay silent under load for cheaper than the heatsink I linked above. At the same time, fanless builds don't dissipate enough heat to enable high overclocking (so you can't eke out the same performance as you could using fans).