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These fans are great. More specifically, their asymmetrical blade spacing is great at breaking up annoying air patterns that symmetrically-spaced fan blades might generate. This provides users with quieter fans.
They are probably pretty good at cooling the computer down, too.
While these fans are pretty cool, they can't be removed without first taking out the heat sink, which means you'll have to bust out your Arctic Silver in order to perform the job properly.