When testing in a power supply laboratory it is difficult to take fan noise readings as the noise from the Sunmoon test equipment and air conditioning corrupts everything. The next best thing in our circumstances was reading off the fan speed with a tachometer to get an idea for the noise. The ambient temperature during testing held constant at 22 degrees, with 1 degree of variation. Each power supply had a consistent time period of 5 minutes to stabilise between each load scenario.
In my experience the following general relationships apply between noise levels and fan speeds, though it can vary greatly between the type of fan used.
OK, this is interesting, the Hybrid fan switch acted closer to an on/off switch! With the fan on, it ran between 1000 and 1020 RPM, hardly a real difference, but fortunately, it was super quiet overall. With the fan in hybrid mode, it didn’t spin at all! No doubt it’ll start spinning eventually, but the unit certainly didn’t have any overheating problems.
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