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 slightly exceeds the specified data after the 24-hour run-in. Of course, there is usually also a smaller series dispersion in play, but that fits quite well.
In today’s DC test, we see that the fan only starts up with voltages from about 3.2 volts, while the fan from be quiet! at least 3.1 volts is required. The cutoff voltage is a fabulously low 1.9 volts, whereby the 54 rpm are also reached exactly here. Great outlet cinema!
The minimum speed is PWM-controlled 440 rpm, and there is no fan stop. Data sheet missed by 40 rpm, peanuts.
Start-up and shut-down behavior
The following measurement curves once again illustrate the very different behavior. Let’s look at DC control first. The new fan reaches a record-breaking 54 rpm at 1.9 volts, below which the fan really stops. This clearly distinguishes it from the 120 model, which will never achieve such dream values in its lifetime.
With the PWM protocol, we can also see very well the progression up to the minimum speed of 440 rpm, which is 40 rpm above the data sheet and which cannot be undershot either.
Power consumption
This value is surprisingly low, especially at low speeds, and truly exemplary. Consider that even at full load, 4 fans alone (without RGB) would consume 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 is possible.
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