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 fans with 3-pin connection. The PWM control electronics almost always stand in the way of clean voltage regulation and it is therefore also not advisable to regulate PWM fans via voltage. Nevertheless, we have also carried out 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.
In today’s test, we see that Corsair’s fan is most able to handle low voltages around 3 volts, while Noctua’s fan requires at least 5.5 volts. In addition, all PWM fans achieve maximum speed and sufficient throughput as well as static pressure only when PWM-controlled.
The best electronics in terms of DC control is still provided by Blacknoise in the NB eLoop X PWM B14XP, since the shutdown speed is well below startup speed and also within the range of good DC-controlled fans. With all other models, the electronics simply run amok at some point when regulating the voltage downwards and the fan suddenly stops, although much lower speeds were possible when starting up. One of the special features of PWM fans is that there are no standards below 20%. Some fans just won’t slow down no matter what you set them to, or they’ll rev up to full speed again at zero percent. I already wrote something about the special feature of the semi-passive mode of the noise blocker.
Start-up and start-up behaviour with DC control
The following measurement curves once again illustrate the very different behaviour of the tested fans:
- 1 - Introduction and Speed Test
- 2 - Test Chamber, Methods and Equipment
- 3 - Alphacool Eiszyklon Aurora LUX Pro ARGB 140
- 4 - Arctic P14 PWM
- 5 - Blacknoise NB B14x-P-BL PWM ARGB
- 6 - Cooler Master Sickleflow 140 ARGB
- 7 - Corsair LL140 RGB
- 8 - Noctua NF-A14 FLX
- 9 - Start-up and shut-down Voltage and RPM
- 10 - Case Fan: Performance
- 11 - Case Fan: Sound Pressure Level and Audio-Samples
- 12 - 25 mm Radiator: Performance
- 13 - 25 mm Radiator: Sound Pressure Level
- 14 - 45 mm Radiator: Performance
- 15 - 45 mm Radiator: Sound Pressure Level
- 16 - 60 mm Radiator: Performance
- 17 - 60 mm Radiator: Sound Pressure Level
- 18 - Summary and Conclusion
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