So here is the thing: My second Octane's fan had a bearing problem, so I bought a Delta WFB1212HE - new old stock with perfect bearing. This is a "full size" 120x120x38mm server-grade fan. I tested it using a 12 V testing power supply and it runs flawlessly - you only hear the 'wind' blowing. So I put it into the Cherokee-PSU and started the Octane and:
there is this terrible whining noise I heard back then, when I tried out a Kaze fan: viewtopic.php?f=3&t=16718730&hilit=kaze
but this Delta fan is the real thing - it's heavy and has a huge engine with ball bearings - how can this be?
So I tried out
Code: Select all
nvram fastfan 1
After a while, it switched back to normal fan speed automatically. (what I never experienced until now)
The whining is gone, the fan is running great. So I guess it had to be calibrated somehow.
@Voralyan: perhaps this could be a solution for your high-pitch-noise-problem, too.