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What kind of noise are you hearing? Vibrations? Wind noise?
Not sure about the 140mm Antecs, I'm guessing 700rpm should be pretty quite on those. The Coolermaster R4s are LOUD, look into getting something better. Noctua, BeQuiet, and Scythe are my main choices there. NF-S12, Gentle Typhoon 1450, etc. Something under 1500rpm is good, plugged to a voltage-control motherboard pin, even better.
Are you overclocking? The Hyper 212 is pretty good, like with the case fans shove one from a better brand on there. Noctua NF-F12s are what I have on my radiator right now.
Not much to do with the PSU. The other thing might be vibrations from your hard drive(s), you can look into either suspending them (mod involving elastic harness), or you can put some vibration dampening on your case. Otherwise, new case?
The good fans tend to be pricey btw, I've probably spent more on fans over the years than what I spent on my Fractal R4 case.
Edit: Oh, and if you have any pictures of your case and interior, please post them. Thanks!
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