You wrote:
1. Your Mainboard does not support PWM fans, which is a pity, because this would be the best solution for your idea.
Yeah... I know... actually I'm quite dissappointed about it as the board is brand new and a fairly recent model of ASRock.
2. I don't know a way to read the CPU temps and adjust the fan speed by that. If your Mainboard supports fan controlling by temperature feature you can go for that, but I doubt it.
Yeah... since 1. doesnt work, I also doubt that 2. will... there is nothing written in the manual to that regard.
I would recommend to simply set the fan at 5 or 7v manually and leave it as it is...
Yes, this is what I see me end up doing. Again, many thanks for your help!