As with any modernized adaptation of an existing technology, closed-loop liquid coolers (CLCs) have become almost fad-like in their adoption. In part, this is because CLCs actually do have very legitimate advantages over traditional air coolers - they are highly noise-to-temperature efficient, for one thing, and have an aesthetic appeal for some users. The other part of this liquid cooling craze, though, I believe is attributable to a general doting of something new.
The thing is, not every liquid cooler is going to be inherently better than similarly-priced air coolers. Just having liquid in tubes (rather than copper-encased capillaries) does not make the units predisposed to superior cooling qualities; this said, a well-constructed liquid-cooling solution can certainly trounce a well-constructed air cooling solution -- it just comes down to the engineering in each product and consideration of other differences (noise). There's a reason we use radiators for large, hot things (cars, for one) in tandem with traditional air-cooling engineering (also found in car cooling systems in the form of air intakes, copper/aluminum sinks, etc.): Both have their place for optimizing maximized potential for thermal dissipation.
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