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Depends on the fan. Just compare the CFM and dBA to find whats better.

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Well 2 140mm fans will pull more air, however depending on RPS's, the 200mm will probably be quieter. 

Besides the temp difference between the 200 and 2x140mm is going to unnoticable.

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I know that the giant side fan on my AZZA Genesis 9000 was shit, even with just mesh it hardly moved air at all, I'd pick twin 140's instead of a single large fan.

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Two 140mms will probably move more air, but as said, the 200 will probably be quitter (and still probably create enough airflow for the case).

 

addition: if you don't have good air flow from the case (positive pressure), pick two 140mms.

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