The only time I've seen this behavior, where the fan spins even though power usage is low, is when the +3.33V and +5V load is unusually high. For example: RGB lighting strips, RGB lighting on RAM, etc. This is because there's no heatsink on the DC to DC MOSFETs for the +3.3V and +5V so they rely on active cooling from the fan to keep cool. But from the looks of your specs, other than the RGB on the RAM, there shouldn't be any unusual +5V or +3.3V load.
Is there any solution to resolve this other than getting rid of the RGB? I have RGB fans connected to a controller that gets SATA power and seems to be causing the fan to spin when connected, even with the RGB on the fans themselves turned off.
SF600 fan won't stop at all
in Build Hardware Troubleshooting
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Is there any solution to resolve this other than getting rid of the RGB? I have RGB fans connected to a controller that gets SATA power and seems to be causing the fan to spin when connected, even with the RGB on the fans themselves turned off.