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. Both fans do not quite manage the specified data and are slightly below it after the 24-hour run-in. Of course, there is usually also a smaller series dispersion at play, so that already fits, especially with the unlit fan.
In today’s DC test, we see that the ARGB fan only starts up with voltages from about 3.7 volts, the one without already at 3.4 volts. The cut-off voltage is 2.6 or 2.9 volts, whereby the technically possible around 100 rpm slightly differs from the measured 240 rpm. And it also doesn’t start up again until 795 rpm. Thus, the fan is not suitable for real DC control because you cannot regulate it down far enough.
The PWM-controlled start-up speed is plenty 120 rpm (start pulse <900 rpm) or 150 rpm (start pulse >1100 rpm), there is no fan stop, the fans then stop below 100 rpm at some point. The start impulses are technically intentional, but then you do get a bit of a fright.
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 non-RGB fan requires 600 rpm as a starting speed, and a standstill already occurs below 105 rpm. The ARGB variant acts here with around 800 and 200 rpm, respectively. This is worse as a control range than the PWM control and makes these fans almost useless as pure DC fans (see above).
With the PWM protocol, we can also see very well the progression up to the speed, which then leads to the physically conditioned standstill and the switch-on pulses to safe starts…
Power consumption
This value of open operation as a case fan is pleasantly low, especially at low speeds. However, you should also consider that at full load, four ARGB fans together would consume around 12 watts, which a single header can just about deliver. From this point of view, a common DC control of all installed fans of a system via a single 1-A header would be rather impractical to impossible and also rather pointless due to the narrower control ranges. But rather PWM, which regulates better.
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 3 watts on the radiators in the ARGB model. And that too only in the peaks, but you have to include it.
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