This board has the same bios as my DH67GD, and it is possible to select a target temperature for the cpu that the bios will try to maintain, speeding up the fan when required.
This temperature is 80C by default, you can change it to something like 75C if you prefer, in the bios.
Then the fan speed will increase when close to the target temp.
The temp. figure will be something like this:
with fan speed at some 1100RPM at idle (you can adjust a minimum if you want) up to 2200RPM (and more if needed) at 75°C.
You need to have a bios revision not under some value, if needed upgrade to 132.