The difference between Intel core I7 and dual core

I have a 2.7 ghz Intel Core I7 macbook, early 2011.  Can someone tell me the difference between this machine and the new macbooks, 2.4 or 2.6 ghz, dual core?
Thanks!

Benchmarks:
http://www.macworld.com/article/2057932/lab-tested-iris-graphics-provide-a-boost -to-new-13-inch-retina-macbook-pro.html

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