Steffen_1 :
Where can i find that option? Have been going through all options but i can't find it.
Maybe that board doesn't have that as a separate setting like the later boards had. Once in the MIT section, you may automatically be in OC mode.
Disable any turbo mode option. (That might be found in the Advanced CPU Features section. Kind of hard to tell when I'm not there able to click open links) Since 39 is the max turbo clock freq, that might be stopping you from going higher until disabled.
Then when you click on The [35X] next to "CPU Clock Ratio, you should be able to enter the value you want with your keyboard.