Im a little confused here, i7 cores in 15" MBP vs 2.66 c2d in 13" MBP

[iperson21]

im a little confused here on which is better (the title doesn't really match my thread, but i didn't know how to describe it)
a high GHZ C2D, like that super power one thats 3.1Ghz or a low GHZ which i've seen in a lot of dell notebooks, like a 1.6ghz one.
so which one would see more improvance in everyday tasks and which one for heavy tasks such as movie/photo editing?

 

[alust2013]

The 2.66 i7 will be much faster than the 2.66 C2D. This is a difference in architecture and a few other features that it includes. They both have two cores and are the same clock speed, but the i7 has turbo boost, hyperthreading and a 32nm process rather than 45nm.

 

[iperson21]

The 2.66 i7 will be much faster than the 2.66 C2D.

i know that, but how does a low ghz i7 compare to a high ghz C2d.

 

[vant]

i know that, but how does a low ghz i7 compare to a high ghz C2d.

The i7 can turbo past the C2D in most cases (GHz).

The i7 also performs better per a GHz.

The exception to this is the i7 low voltage series, which pretty much just goofs the naming scheme.