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You have more control. The "AI" feature simply adjusts the fsb until you get an increase in cpu speed of 5%, 10%. I think it may also run your ram at SPD settings (can't back that one up though). And according to some, it also adjusts the core voltage to improve stability.
If you o/c normally, you have control over all that stuff anyway, plus you can change the fsb by 1Mhz at a time. So if you can overclock 10% WITHOUT raising vcore, then why do it???? Raising the voltage will just generate heat if the cpu already runs stable.