Turbo Boost is an automatic overclock based on thermal headroom; i.e. if your chip is running normal/cool, then during periods of activity it will increase its own clocks by an amount determined by how many threads are running. You cannot manually overclock the CPU any other way (e.g. in the BIOS as you might normally) since the QM chips are multiplier locked, and the G74 has no utilities in the BIOS to alter anything to do with the clocks.