This may be an impossible question to answer at a very general level, but just in case... Which is considered to be better in terms of noise-level-for-same-amount-of-air-shifting? A large fan or several smaller ones? I googled it but what I found gave me a headache (full of graphs with unlabelled axes and mysterious acroyms!). I would guess that the larger fan would be quieter, but I don't know. Being more specific, I'm trying to guess which would be quieter for same cooling, the corsair 200r with potentially as many as 8 12cm and 14cm fans, or the haf 912 with a couple of 20cm ones plus a 12 and 14. But also curious about the question in general. Also wondering if logically one wants different characteristics in an intake vs an extractor fan?