Start-up and shutdown voltage
This chapter is to be enjoyed with much caution and attention, as long as it does not concern purely analog, thus DC-controlled fans with 3-pin connection. The PWM control electronics almost always stand in the way of clean voltage regulation and it is also therefore not advisable to regulate PWM fans via voltage. Nevertheless, we have also performed this measurement for all models, whether 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, let’s exaggerate the maximum speed at 100% PWM and compare it to the spec sheet. The Arctic fan doesn’t quite make the stated data, missing about 50 rpm.
In today’s test, we see that Arctic’s fan can handle low voltages starting at 3.2 volts, while Noctua’s fan requires at least 4.4 volts. Furthermore, all fans only reach maximum speed and sufficient throughput as well as static pressure when PWM-controlled, so neither are pure DC solutions.
Neither provide the best electronics in terms of DC control, as the shutdown speed is well above startup speed and not in the range of good DC-controlled fans. Here, the electronics simply run amok at some point when regulating the voltage down and the fan suddenly goes off, although much lower speeds were possible during startup. One of the special features of PWM fans is that there are no standards below 20%. Some fans then simply no longer go slower to regulate, no matter what you set, or else at zero percent they turn back on full.
Start-up and turn-on behavior with DC control
The following measurement curves once again illustrate the very different behavior of the tested fans:
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