I have sabertooth 990FX 2.0, I change the speed to silence in the bios (Enabled Q-Fan), but the fans keep running 100%. I can't control it. My CPU fan control is 3 pins.
I don't think the BIOS can control a 3-pin fan, you need the 4-pin connection for PWM. Your option is to buy a fan with PWM, or to buy a fan controller.