Ok, this is a comprehensive recording of the noise at different RPMs (manually set via TG Pro).
As you can see the whine doesn't scale uniformly; While I can hear more of the low frequency hum, I actually hear the high-pitched whine less at the highest RMP I tested (1700) RPM.
All was recorded on an iPhone 13, about 10cm/4" from the rear of the mac.
You can listen for yourself.
You are welcome to pin this post or use it as reference.
Mac Studio M1 Ultra 48-Core 128GB 1TB.
Country of delivery: Italy
Date of purchase: March the 8th, 2022
Date of delivery: April the 1st, 2022
Assembled in China
Mac Studio M1 Ultra 48-Core 128GB 1TB at
1100 RPM
Mac Studio M1 Ultra 48-Core 128GB 1TB at
1300 RPM
Mac Studio M1 Ultra 48-Core 128GB 1TB at
1500 RPM
Mac Studio M1 Ultra 48-Core 128GB 1TB at
1700 RPM
I'm now testing working with it at 1700 RPM.
The fan noise itself doesn't botter me and it makes the whine much less noticeable, not to mention there's physically less whine.
IT's something with the way the air traverls through the metal itself.
I still have to decide if to send this machine back, but I surely prefer working with it like this.