That may be true - in open air (case fans) - but my primary concern is finding fans that perform the best on a HS or radiator while still having a reasonable noise level/signature. And this is where your test has proved very usefull to me, where the Noctua -> golfball (for example) at the same rpm range, produce wildly different results.
Edit: more to the point - same dbA range, whether or not that's exactly the same rpm.
Exactly. Of course I still don't know what a golfball (and some of those other) fans sound like, but I will today or tomorrow.
Thanks again for your efforts.
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