Turbo boost works at intensive works, you have in cpuz stress and benchmark, press stress and see if boost works, (keep in mind if you press stress system might be unresponsive soo close everything and run stress then).
Whats your mobo? This is definition of Turbo boost -> Max turbo frequency is the maximum single core frequency at which the processor is capable of operating using Intel® Turbo Boost Technology. Frequency is measured in gigahertz (GHz), or billion cycles per second.