Summary: Zalman's CNPS14X CPU cooler was, while not the quietest in my tests, far from noisy, but its low noise levels are perhaps its best feature. Many users want quiet but powerful systems, and the CNPS14X certainly helps fill that role by being a quiet CPU cooler.
Pros: Quiet, Option for up to three fans, Performance with three fans is good, Quality thermal grease included
Cons: Price to performance is lackluster, Troublesome to install, Lacks extra fans, Installation manual unclear
Excerpt: Installing the Zalman CNPS14X CPU cooler is sort of like doing P90X exercises—there’s a possibility of extreme discomfort, but if you’re tough enough to bear the burden, you will ultimately see good results.
Pros: Cools well; quiet; extra fans can be added.
Cons: Painful install; performance not much better than cheaper Hyper 212 Evo.
Summary: In any event, the stock Zalman CNPS14X heatsink comes with a single 120mm PWM fan nestled away in the center of two aluminum fin towers. The 120mm fan runs at 1350-900RPM and the two towers are connected to a copper base plate by no less than six, 6mm diameter copper heatpipes.
Conclusion: The cooling capabilities of the CNPS14X may have left a little to be desired, but in the noise department it didn't disappoint. It's definitely one of the quieter air coolers we've had on test for a while thanks to its single 140mm fan, and coolers marketed towards those looking for quiet computing...