Noctua NF-F12 annoying "whine"
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Solved by Pat-Roner,
I just got this reply from Noctua, so it seems to be intended with the iPPC range.
Swapped them for regular NF-F12's and they are dead silent.
"I'm afraid that these noises are normal for iPPC fans. These use three phase motors which can be louder than regular motors especially when running at reduced speed.
Increasing the fan speed might help though.
In case this isn't acceptable, I would suggest that you have your retailer replace these fans with regular beige-brown NF-F12-pwm fans as these are quieter.
Best regards,
Alexander Dyszewski
Noctua support team"
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