The difference in noise level between the Arctic fan (24.5 dba) is barely noticeable compared to the Corsiar OEM fan 30.85 dba.  Sure, replacing the OEM Dell AVC front fan will be a huge difference.  But replacing the Corsair fan up top probably won't be a big improvement.   [URL]  
I recently installed liquid cooling (CORSAIR Hydro Series 120mm) to my Aurora R9. It’s quieter and don’t get random loud fan like use to. My question is can I replace my front fan and top fan with this. I'm very sensitive to noise, I want to be quiet as possible. I can use MS1 afterburner underclocking my fans while I game achieved the goal of quieter fans, but the GPU temperature is around 88-90c. Once I reset my fans to normal they become very loud to cool down from overclocking. If the fan is compatible it would be life changer. I would appreciate if anyone knew before I purchase them.
Aurora R9, replace fan with Arctic F12