Cannot Set PWM Fan Duty Below 60%

edgetrading

Bronze Level Poster
I have just added 2 Noctua AF-14 PWM fans to my system stated below.

The 2 fans are connected the the same header. The ordering is as follows:

- Noctua extension lead connected to fan header.
- Noctua Y splitter connected to the extension.
- Fans connected to the ends of the Y splitter.

When trying to manually set the fan curve in PWM mode, I can't set the fan duty below 60%. Though if I click on the pre-defined "Silent Mode", it does appear able to set the fan duty below 60%.

Why is this happening? I had thought PWM fans could be set to spin at very low speeds.

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edgetrading

Bronze Level Poster
I changed the extension lead and Y splitter, but that did not help.

Using just a single fan and a new extension lead did not help, so I don't think a single fan is bad. Though both could be.

Could the BIOS have a broken setting?

Could the "Optimise All" button fix it? It tells me that I will need to wait 2-5 minutes if I click it, but I have not let it actually run.
 
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