Noctua's NH-C14S and NH-D15S Are Single-Fan Versions Of Predecessors

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The C14's twin fans are rpm too, so a deeper fin stack & pwm make the C14S more attractive, especially if it's a bit cheaper. Damn, I have C14 in a cupboard, bought on special & haven't used it yet.
 
A single fan D15 probably performs just was well as the dual fan during most work loads. I run my D15's fans at about 500rpm and just forget about them. Rarely see temps above 55*C on a heavily overclocked 4790k (gaming workloads). Rendering is a different animal, 800rpm for premiere pro when exporting a project.
 
The d15s plans to try and match performance of two fans with a single fan at a higher rpm than previously used. How does one fan spinning faster manage to be 'quieter' than 2 at lower rpm's? Sounds counter productive to me. Especially since it's planning to retail at $80 when an nh-d15 can be had for $91 free shipping from amazon right now.
 
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