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guess it will do me better in the long term also as games needs get more demmanding

I see what you did there
Afaik there is no difference between the dual core i3 and the dual core i5 aside from clock speed and the speedturboboost thing, but disable that. Get an i3 and overclock it to 4.5ghz. Or get a quad core i5.
How do you overclock an i3 to 4.5GHz?
He is comparing the i3 5xx series and the i5 6xx (from the look of it) those i3's clocked like mad effectively making the dual core i5 pointless to the enthusiast market, you can't do that with a modern i3.
He is comparing the i3 5xx series and the i5 6xx (from the look of it) those i3's clocked like mad effectively making the dual core i5 pointless to the enthusiast market, you can't do that with a modern i3.