Fair enough
What did i miss?
Think of a processor as a clock. The frequency is how many times the clock ticks every second. Now on a desktop system there is a point where if the processor can't draw enough power it can't tick as many times as it expects it should. When that happens you get processing errors. Now to prevent this you supply more power to the chip. This consequently stabilizes it and eliminates the errors (but it does generate more heat).
Now, i could be completely wrong but i doubt that SoC manufacturers are deliberately designing chips to take more voltage then they need so i can't see how undervolting the CPU while raising it's clock frequency is going to have the effect you describe.
I think i might have to go do some reading coz something funky is going on here.
**UPDATE**
So i did some quick reading and it turns out that i was bang on the money. Although undervolting a CPU when it's running at stock speed can reduce heat and save battery it not actually a good idea to undervolt and then overclock the chip because, like in a desktop PC, you stand a very good chance of making the system unstable or causing processing errors.
This
link breaks it down nicely and explains it in plain english. The author is talking about the Thunderbolt but the prinicples are the same.
/me wonders at what point he can say "Don't test me"