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Nexus PWM (D12SL-12 PWM)

According to the information on the official company web-site, Nexus, inspired by definite success of their Basic series, released another 120 mm fan model with a simple and logical name – Nexus PWM. The box of this new fan is very similar to that of the Basic series, just the colors and the information on the package are different:

The fans are bundled with four silicone mounts of acid-purple color, but no PATA power connector:

The fans are made in China and come with 3-year warranty, just like the Basic fans.

Nexus PWM looks more interesting than the previous fan model, because the fan itself and the frame are made of clear plastic:

Nevertheless, there is no LED lighting, although it could make this fan even more beautiful and competitive. But, it is no big deal, serious products very rarely come with modding-friendly features anyway. The fan measures 120x120x25 mm and each has 7 blades. The rotor is 45 mm in diameter:

 

The supporting rods are now a little bigger. Nexus PWM fan blades are dramatically different from those of the Basic series: now they are expanding away from the rotor and end with a distinct “tip”:

Nexus doesn’t explain why they have changed the blades shape so dramatically, but focuses mostly on the automatic adjustment of the rotation speed between 500 and 2000 RPM using pulse-width modulation method (PWM). The maximum airflow from this fan makes 76 CFM, which is a pretty typical number for this rotation speed. The noise level has, definitely increased and now varies from 15.5 to 26.9 dBA. Nevertheless, it didn’t prevent Nexus from calling their fan “the quietest in the world” again. A quick comparison of the other participating 2000 RPM fans’ acoustics did, however, show that the claimed noise spec is in fact the lowest of all.

Nexus PWM’s startup voltage is claimed to be at 6.5 V, which is 0.5 V lower than that of the Basic fans. The operational voltage interval remained the same, but power consumption decreased and now makes 2.04 W at 0.17 A current, although the sticker on the fan rotor claims the same 0.30 A:

In conclusion I would like to add that Nexus PWM is priced at $18. Now it is time to check out the test results and see how much better or worse the PWM model is compared to Basic:

Well, looks like Nexus PWM has a completely different character. Yes, this fan generates high airflow; yes, it consumes not so much power even at maximum rotation speed; yes, it features PWM controller and looks attractive. However, the acoustics is really poor. The fan doesn’t crackle too loudly, but this crackling is stable and exists over the entire operational range. As a result, it can be considered more or less acoustically comfortable at 900-930 RPM, which is 100 RPM lower than by Nexus Basic. Therefore, it loses to the Basic series in airflow at identical noise level. Low startup voltage of only 3.6 V will hardly be a consolation for the Nexus PWM owners.

 
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