Questions about be quiet! SilentWings 3 PWM High-Speed

I have equipped all the fan slots in my case (Corsair Obsidian 350D) with SilentWings 3 PWN highspeed. (4x140mm; 1x120mm) Now I'm still thinking about whether I should buy the Corsair Commander Pro fan controller, as my mainboard only has 2 fan connectors. I am very happy with the fans themselves. The only thing that bothers me at the moment is that when the PC is on the table, the fans are already audible at minimum speed. I don't know if this is due to the fan control (software) from Asus or the Y-cables or if the minimum speed of the high-speed fans is simply higher than that of the normal fans. Of course, my Asus controller doesn't know that two fans are connected to this port. I assume you can only hear it because all 5 fans are running at minimum speed. With the Corsair Comander Pro, however, the problem should be a thing of the past, since each fan is recognised individually in the controller and is thus switched on and off individually. I wouldn't do without PWM because the software recognises how fast the fan is actually rotating and can therefore regulate it more finely.

The connections on the power supply unit are for cables that supply power to your mainboard, graphics card, SSD, HDD, etc. There is no connection for PWM fans. There is no connection for PWM fans. However, on your mainboard you will probably (without guarantee as I don't know which board you have) have free connections with which you can control the fan.