Your Sager is way better bro 

Because 660M is Kepler and 670M is Fermi....

Totally different architecture, you can't compare them core to core imo.

Resource? How about, Fermi use alot more power than Kepler but its not that much faster.

and again.

Maybe this can shed some light.

The key is that you can't really compare two different architectures just on core clock speed... in that case we could easily compare AMD and Nvidia just by the core speed, which would generally be different because of how scarce components can be placed in the die. What Nvidia has removed from the Fermi has to be compensated by something in the Kepler architecture, so it's no big deal if the clock speed increases, but the result of the entire die does not beat the 670M. Again Kepler is a focus on efficiency and a slight improvement on performance, in short a give and take. Having best of both world is what we called the ideal GPU.

If you want to compare clock speed, you need to make sure other things like architecture are constants in the discussion subject.