In this section we look at the technology engineered into the Noctua fans we're looking at.

I've added some images from Noctua's own site to help illustrate the features.

The NF-P14 FLX and NF-P12 share similar technology. Both use Noctua's VCN (Vortex-Control Notch) fan design.


Vortex-Control Notch design.

Twin notches placed at staggered positions from blade to blade have an interesting and beneficial effect.


Staggering aids performance.

They allow the suction and pressure sides of the airflow to mix more smoothly by producing smaller vortices which create less disturbance and in turn less noise.


Smaller vortices.

Indeed, these numerous smaller vortices also effect the size of the large vortices produced by the trailing edge of the fan blade tips. By making these 'edge' vortices smaller noise levels are further reduced.


Trailing edge disturbance is lessened.

All the Noctua fans on test come with their SSO (Self-Stabilising Oil-pressure) Bearing technology but the newer NF-P14 FLX also includes a Metal Reinforcement Hub and Bearing Shell which Noctua say should 'achieve ultimate manufacturing precision, high durability and vibration-free running'.


The NF-P14 FLX's special Metal Reinforced Hub.

Moving onto the NF-S12B FLX schematic we see a the blade tip change that sets it apart from the original highly regarded NF-S12.


The NF-S12B FLX's blade design.

Also of note is Noctua's SCD (Smooth Communication Drive) system. Both of the 120mm fans come with the first generation of this technology which aims to improve quiet running by 'eliminating torque variations and switching noises'. The NF-P14 FLX also sports this feature but packs the newer 2nd generation of the system which should offer even better quiet performance!