AF120 vs SP120

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I am going to get the NZXT S340 case and need case fans. The SP120 fans have better CFM than the AF120 fans though would that matter as the SP120 fans are designed for use in restricted areas and the AF120 fans are designed for unrestricted areas. Which one is better?

 

[sizzling]

For a case the AF120

The SP's are designed to be bolted against to radiators or coolers.

 

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For a case the AF120

The SP's are designed to be bolted against to radiators or coolers.

Would you know if the Cougar Dual-X fans are any good?

 

[sizzling]

I have no first hand experience with those