There was definitley a multiple harmonic effect going on, but I think there will still be a whine present at any rpm as when the fan speed is turned up or down, a new whine starts as one stops, there's like multilpe overlayed whines at all speeds until I hit ~800rpm. They move a lot of air but the noise is awful. I will try them on separate channels though thanks for the suggestion.
How do the Noctua NF-P12 go on rads? Their noise and static pressure ratings are appealing.
edit - strike that I see it went horribly (didnt think you tested that model!)
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