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 didn’t run at all until we got up to 60% load, meaning the PSU remained completely silent and should do for most day-to-day operation. Even when we got it to 100% load, the fan was still little more than a whisper and you’ll likely never hear it once it’s installed in a chassis.
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