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 still almost manages 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.
In today’s DC test, we see that the fan only starts up with voltages from about 3.6 volts, while the fan from be quiet! requires at least 3.2 volts. The cutoff voltage is 3.1 volts, whereby the ample 500 rpm are also reached right here. But it is a PWM fan and can do much more than the manufacturer has written in the data sheet!
The minimum speed is PWM-controlled 561 rpm, and there is no fan stop.
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 a rather mediocre 561 rpm, below which the fan comes to a powerless standstill. After a longer run-in period, you can still get a bit below that, but definitely not reach the 400 rpm stated in the spec sheet.
With the PWM protocol, we can also see very well the progression up to the minimum speed, which, however, cannot be undershot. Too bad.
Power consumption
This value is surprisingly low, especially at low speeds, and truly exemplary. Consider that even at full load, 4 fans (without RGB) alone 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.
19 Antworten
Kommentar
Lade neue Kommentare
Urgestein
Urgestein
1
Mitglied
Urgestein
Veteran
Mitglied
Urgestein
Urgestein
Mitglied
Urgestein
Mitglied
Urgestein
Urgestein
Urgestein
Mitglied
Mitglied
Urgestein
Alle Kommentare lesen unter igor´sLAB Community →