How much better is a i5 3570 than a i7 920?

[lord hircine]

My i7 920 is 2.6ghz and the new CPU i'm planning on getting is the i5 3570 3.4 ghz, i want to play mmorpg that are very cpu demanding like Guild wars 2, Tera on max with lots of players on screen. And i was wondering how much better is a i5 3570 over a i7 920? Is it a little bit better, better, or a lot better? Its going to be paired up with a gtx 660.

 

[soccerguy271]

http://www.anandtech.com/bench/Product/701?vs=47&i=499.500.501.502.503.504.505.506.25.26.27.28.29.38.39.40.41.42.43.45.46.53.54.55.60.61.62
That should explain it.