What do you mean breaks Q-fan control? Exactly what?
I have been running the 901 BIOS for over a week, and haven't seen that. But I use default standard profile in BIOS (though I set them explicitly to PWM). I use AIsuite to control them in windows.
I also installed the 901 Bios and am having no issues. Question if I may... I just ordered the ASUS Ryujin 360 to replace my Corsair 110i as it wasn't cooling my i9-10900k adequately, and I was wondering if you reccomend using the Bios Q-fan control or AIsuite to control it and my Chassis fans
I have used AISuite to control my fans on Asus motherboards over a number of generations and boards and haven't had an issue. I like the convenience of changing profiles on-the-fly in Windows. Others prefer setting them in BIOS. Also, if you have an Asus GPU, the GPU temperature is available as a source temperature. It is not available in BIOS.