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 with 3-pin connector. 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 also performed 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.
First, however, we check the maximum speed at 100% PWM to be on the safe side and compare it with the data sheet. The fan even exceeds the specified data, even after the 24-hour run-in. Of course, there is usually also a smaller series dispersion in play, but that fits quite well. More for less.
In today’s DC test, we see that the fan only starts up with voltages from about 4.7 volts, while the fan from be quiet! requires at least 3.2 volts. The cut-off voltage is 4.4 volts, whereby the technically possible 500 rpm is a long way off. This makes the fan rather unsuitable for real DC control, because you can’t regulate it down far enough.
The minimum speed is PWM-controlled 447 rpm, there is no fan stop, the fan keeps on spinning.
Start-up and shut-down behavior
The following measurement curves once again illustrate the very different behavior. Let’s look at DC control first. Here, the new fan achieves slightly below the specified 500 rpm, and there is no standstill.
With the PWM protocol, we can also see very well the progression up to the minimum speed, which, however, cannot be undershot. Well.
Power consumption
This value is surprisingly low, especially at low speeds, and truly exemplary. Consider that even at full load, 5 fans (without RGB) alone would consume far less than 10 watts combined. This is absolutely no problem, even for the motherboard and cables. From this point of view, even DC control via a single 1 A header would be possible, but with the limitations already mentioned.
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