Yeah, you won't notice much improvement with an i7.
If you overclock both, the i5 should perhaps even overclock further than an i7, and by doing so, the i5 will win over the i7 anyways.
Biggest upgrade for you is further OC or a second GPU (though I would never run dual GPU's myself, too many goddamn problems on both green&red...)
http://www.techspot.com/articles-info/71...CPU_03.png
If you overclock both, the i5 should perhaps even overclock further than an i7, and by doing so, the i5 will win over the i7 anyways.
Biggest upgrade for you is further OC or a second GPU (though I would never run dual GPU's myself, too many goddamn problems on both green&red...)
http://www.techspot.com/articles-info/71...CPU_03.png