Best 80mm case fan under 5$

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From my experience, 80mm fans are not particularly great to begin with and tend to be a bit noisier than a 120mm fan. Bearing that in mind, I reckon you should try and find a few more bucks and get something like the Noctua NF-R8 80mm case fan.

Rabmac

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Nov 29, 2015
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From my experience, 80mm fans are not particularly great to begin with and tend to be a bit noisier than a 120mm fan. Bearing that in mind, I reckon you should try and find a few more bucks and get something like the Noctua NF-R8 80mm case fan.
 
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xXCrossfireXx

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Jan 16, 2016
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For quiet, as well as fast, go for the Rosewill on there. Beware it has a sleeve bearing though, which won't last as long as Hydraulic, SSO, Ball, etc.