Guys, seriously...
I say this alot, you want to know something? google i7 architecture, then google, phenom II x4 architecture.
Google or wikipedia or bing anything you don't know before asking here...
You could probably google "why is i7 better than phenom II"
After reading all the stuff you can google/bing, you should have your answer.
We don't know everything, and search engines are your friend.