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 not only manages the stated data, but is even a good 5 percentage points above it. Of course, there is always a certain amount of series dispersion at play here, so that fits perfectly.
In today’s DC test, we see that the fan starts with voltages starting at around 2.9 volts, while Noctua’s fan requires at least 4.4 volts. In addition, all PWM fans achieve maximum speed and sufficient throughput as well as static pressure only when PWM-controlled. So, as is almost always the case, I would not recommend voltage-only control.
The ample 550 rpm minimum speed is an acceptable value for such a fan, although rather useless in practice. PWM-controlled, the fan can even be switched off, since a fan stop exists. That’s it.
Start-up and shut-down behaviour
The following measurement curves once again illustrate the very different behaviour. Let’s look at DC control first. Here, around 550 rpm are reached, below which the fan comes to a standstill. The DC control is thus obsolete and one should rather also set PWM and the fan stop.
With the PWM protocol, we also see very well the fan shutdown, because there is the mentioned limit for it. The rest then reflects the data from the bar chart.
Power consumption
This value is quite high, but quite acceptable for such a powerhouse. Since you can save push-pull operation at maximum speeds even on 60-mm radials (spoiler), the total is then still manageable. As a case fan, you would either not use them or only greatly reduced. Still, keep it in mind and always do the math.
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