MSM8255 and MSM8255Turbo - what is the fundamental difference?

Question

Iron

Here in some devices (mobile phones, etc.) the processor is MSM8255, and there is also MSM8255Turbo.
Snapdragon MSM8255 - 1GHz.
Snapdragon MSM8255Turbo - 1.4-1.5 GHz Are
they technologically different?
Or is it just a software difference? (One is officially overclocked, the other is not).

Answer 1

The turbo also has a next-generation gps module, which seems to be supported by Glonass, here
are the detailed
specs