I haven't tweaked this 470 yet but I will admit a highly OCed 280 out of the 3 I had almost competes with my 465 in horse power. Fermi is great, but the lower end ones aren't that much more powerful than the high end 200 series. Your i7 at 4.3ghz would beat me. The i5 750 is the same as an i7 minus HT so it would make sense for me to make a higher CPU score at a higher frequency. If you test 06 you'll see you probably beat me there even at 4.0ghz cause 06 is more CPU dominant.
Also if you notice, your FPS is only slightly higher than mine in the 2 benches. The only reason my avg is lower in New Calico is because I started artifacting.