I'm not a fan of the NH-D14, and IMO either use the Corsair H70 or better the H100. I'm running the H100 + Sabertooth X79 and love the look and the cooling is good; clean looks. The noise isn't much different than any other HSF. Neither is close to a 'real' water cooling loop.
Ever try cleaning a conventional 'finned' HSF? The Corsair Hydro series takes me a few minutes and sucking the dust with a vacuum. A nest of fins on the NH-D14 requires me to remove the HSF assembly and washing it off to get it cleaned properly.
If your fan is spinning @ 100% then use one of the two CPU headers to control it; the H100 has it's own built-in for up to 4 fans.