My take on Turbo mode is that it IS a feature. However, it also IS overclocking. Overclocking is taking the clock on the box and going beyond it, imo. However, Turbo Mode is an overclocking feature that is insured by Intel which is why EVERY core i5-750 can reach:
3.2 with one core in use
3.06 with two cores in use
2.93 with all cores in use
I don't know if you all will think of this as a similar example, but I kind of think about it in terms of speedstep and Cool and Quiet. If we were arguing about wattage instead of CPU superiority, and only one of the CPU's had underclocking & undervolting abilities, people would be bound to claim that the comparison was unfair. In a similar way, I think of Turbo as reaching THE HIGHEST THRESHOLD of performance with 1-4 threads WITHIN the defined TDP.