A problem with pc's is noise. One solution is slower CPU's made with today's chip technology so they need no cooling fans. Coupled with power supply fans designed for minimum noise. But someone suggested converting any high-spec contemporary PC into a very quiet one by replacing the power supply and the CPU and GPU cooling fans with liquid-cooled versions, for 300 euros. Is that a good idea? Is it safe? Does it last? Also heard about huge copper coolers that remove heat without any moving parts, by conduction alone. Are these a good idea? Can they cope with high-spec PC's today? Are they more expensive than liquid cooling?