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So I just got a CM hyper N520 for ABOUT 20$ ON Ebay. As such I plan to replace the 'meh' fans on the stock unit with better fans that are PWM.

Any suggestions recommendations or experiences with these fans In which I am looking at?

Noctua NF 9b PWM

Scythe Kama 92mm PWM fan

Gelid Solutions Silent 9 Pwm fan.

I was looking a bit more at the noctuas because of this video
http://www.youtube.com/watch?v=gqp6BxxqlC8.

But any iput would be Great!