Type into your search bar, Asrock Extreme Tuner (I'm assuming you have it, I have it and its quite useful. If you don't, download it or find it on your driver disk)
Then go into the Fan Control Tab, and put the CPU FAN1 and CPUFAN2 Fan Target speed to 1, 2 or 3. It'll quieten down that bad boy. I have it set on two, makes no noise and barely any cooling disadvantage.
Also that bios thing is the same as Asrock Extreme Tuner. You can put that CPUFAN1 setting and CPUFAN2 setting to 1, 2 , or 3 and apply and itll do the same thing.