Originally Posted by
pseudoswede
Yes, the 64gb model runs on a 1.5GHz processor (as opposed to 1.2GHz). Although, using Preware, you can overclock your 16/32gb model to 1.5-1.7GHz (in exchange for battery life, of course).
It's the same CPU on all models. On the 16/32GB models it's underclocked to 1.2Ghz, whilst on the 64GB model it's set to it's correct speed of 1.5Ghz.
"Overclocking" the smaller models to 1.5Ghz thus isn't really overclocking the CPU, although there could still be issues with overheating the unit as a whole.