Can't Set CPU Fan Duty Cycle Below 60%

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I've just built a new PC using an Asus TUF Gaming Plus WiFi Z790 board and a Noctua NH-D14 cooler. The Noctua cooler has a Noctua NF-P12 PWM fan and a Noctua NF-P14 PWM fan connected via a splitter cable to the CPU fan header. All works fine but in the BIOS I can't set a CPU fan duty cycle below 60% for the fan curve whereas I can for the other fans.

Why is this - perhaps something to do with connecting the fans via a splitter cable?

 

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i can't see any sign of fan tuning utility in the BIOS - what do I look for?

I've now connected the two Noctua fans to separate fan connectors (CPU_FAN & CPU_OPT). I still can't set a fan duty cycle below 60% in manual mode in QFan. I'm unsure whether this is by design or a bug.

 

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According to the manual for your motherboard, it can be found in the BIOS under Monitor -> Q-Fan Configuration -> Q-Fan Tuning.

Well spotted! I'll give it a try.