Really? I guess that makes some sense. Is this with or without overclocking?
Yes. On Sandy Bridge systems you can only over-clock by adjusting the multipliers. You can adjust the base multiplier, and (sometimes) the size of the steps for the Turbo Boost.
BTW: the Turbo Boost depends mainly on temperatures. The cooler that you keep the CPU, the longer the Turbo Boost will run before it slows down.