Thanks - I did see your comments/notes about them being high-pitched and/or clicky, so I assumed that was the issue. I have a similar issue with S-Flex fans... they seem to be 'quiet' fans, but from the recordings I've heard, there's a underlying and noticable tonal-motor-whine-niose going on.
Anyway, I took a chance and now have a Golfball on the way (very difficult to find the 120mm 2000, btw. I ordered it from performance-pcs, but they had to order it from germany). I'm hoping to tune it down into the 26-28 adjusted db range of your chart as a HSF cooler.





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