Start-up and shut-down voltage
This chapter should be read with caution and attention as long as the fans are not purely analog, i.e. DC-controlled fans with 3-pin connection. The PWM control electronics almost always stand in the way of clean voltage regulation and it is therefore also not advisable to regulate PWM fans via voltage. Nevertheless, we have also carried out this measurement for all models, regardless of whether they are DC or PWM fans, because even strange results say a lot about the control electronics and the use as a DC-controlled fan.
But first, to be on the safe side, we check the maximum speed at 100% PWM and compare it with the datasheet. The fan doesn’t quite manage the stated data even after the 24-hour run-in, but it’s just barely below it. Here, of course, there is always a smaller series dispersion in the game, so that still fits almost perfectly.
In today’s DC test, we see that the fan only starts up with voltages from about 2.3 volts, while the fan from be quiet! requires at least 2.8 volts. In addition, all PWM fans achieve maximum speed and sufficient throughput as well as static pressure only when PWM-controlled. So I would not recommend a pure voltage regulation.
The approximately 367 rpm is a good value for such a fan, although rather useless in practice. PWM-controlled, the fan can also be switched off, so fan stop is possible.
Start-up and shut-down behaviour
The following measurement curves once again illustrate the very different behaviour. Let’s look at DC control first. Only about 418 rpm are reached here, below that it gets tight and the fan comes to a powerless standstill. So the DC control is somewhat obsolete.
With the PWM protocol, we can also see the fan running very well because there is no minimum speed. The rest then reflects the data from the bar chart.
Power consumption
This value is amazingly low and really exemplary. Consider that 5 fans alone together would only draw an ample 10 watts. This is absolutely no problem, also for the motherboard and the cables.
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