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.
The fan noise at 100% load was certainly noticeable, but certainly not at the point where we would be reaching for ear plugs, yet Eco mode simply blew me away, with barely audible performance all the way to 100% load and completely silent passive cooling up to 60% load.
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