All Core i7 processors are unlocked
I already noticed this myself. Locked processors force the processor to run at a particular multiplier to the base speed of other components. For example, my Core i7 920 at full, non overclocked speed should run at 20x the 133 MHz baseline. I should not be able to change the multiplier to 19 or 21 or something different, but I can.
This is helpful for overclocking, because if the baseline is too high, other components might not work correctly. By increasing the multiplier instead, the processor can run at higher speeds without forcing everything else to run at a much higher speed.
Normally Intel only allows the most expensive chips to change their multiplier. Because of this difference, my 920 is really no different than the Core i7 965 that costs almost 1000USD more.