My mistake it becomes enabled at 34.
^ Oh so I assume it's the same for everyone. There's no specific reason as of now but I figured that having the option make it disabled might be useful at some point. Anyway, as I said, I like turbo boost and would enable it even if it can be disabled.
So here's another question. Can I change CPU Multiplier and change Turbo Boost Multiplier making the two different? Let's say I make CPU Multiplier at 42 and Turbo Boost at 40? What would happen? If the numbers are exchanged what would happen then? I actually have the speedstep on too. Would it jump to 40 then 42 at max?