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quite bit of difference some will agree some wont.
even to a i3570k for eg in a lot of things can be upto twice as fast
http://www.anandtech.com/bench/Product/109?vs=701
so its a good upgrade to haswell.
Where do we see the improvement? I've only looked at the likes of the physics test in firestrike which shows no difference at all, neither the 2500k nor the 3570k outperforming the i5 750. (Distinct lack of Haswells to compare with)
What benches/uses can we see a big difference in?
Edit: Of course the 2500k & later start higher and go higher still while drawing less power, just on a per-clock basis I'm unconvinced there is a massive gulf.
Edit2: So found some benches comparing the 750 with 2500k and 3570k and it looks like per-clock they're fairly similar overall, there are some places where it swings wildly one way or the other. The newer ones do win out, but the gap seems small (about 6% from 750 to 3570k on the overall performance comparison done per clock) however I've no idea if the links are particularly trustworthy. 750 - 2500k 750 - 3570k
i poste a benchmark earlier showing with a i3570k vs your cpu is was close to twice as fast at stock. in many programs.
in some games its close to 40-50 fps difference. i dont get where you pull 6 percent from lol.
thats stock ve stock so when both oc probably be about same difference plus the new intels will clock higher anyway so it still is a good boost over what he has. in some games alone in games like wow upto 40 fps boost shows the difference.
noticed you have a i5 750 also. its a big increase in certain games some will say different some will agree but bench them and see.
mine can get 3.7 easily on 1.25 volts, Ive taken to running it at 3.4 lately though to keep the hsf from getting too loud as the summers started.