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 easily manages the specified data and is only very slightly below it after the 24-hour run-in. Of course, there is usually also a smaller series dispersion involved, so that already fits.
The following measurement curves and bars once again illustrate the very different behavior of the control. In today’s DC test, we see that the fan only starts up with voltages from about 4.1 volts. The cut-off voltage is 3.8 volts, whereby the technically specified 600 rpm deviates slightly from the measured 520 rpm. In a positive sense. And it also starts up again at 617 rpm. The fan is thus even suitable for real DC control, since you can regulate it down far enough.
The PWM-controlled start-up speed is 589 rpm (start pulse, then 577 rpm), so there is a fan stop, because fans remain below as planned.
Power consumption
This value contradicts the data sheet a bit. There, you specify 2.16 watts for start-up and 1.2 watts for continuous operation. However, we measure up to 2.5 watts in the peak (2.16 watts on average). If you trust in not exceeding the 1 ampere with 10 DC-controlled fans at the fan header, you will grill your motherboard mercilessly here. more than four fans are definitely not possible. PWM control left aside. There you go.
However, power consumption is not the same as power consumption, because it fluctuates quite a bit between radiator operation and free installation as case fan! This graph is also new and should help in assessing the system load, as the power consumption increases to a maximum of 2.8 watts on the radiators. And that too only in the peaks, but you have to include it.
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