It's not a quad core, it's a dual core with hyper threading, i guess in crysis 3 it(ht) doesn't matter much as you can see in the techspot benchmark the i3-3220(ivybridge) trails in comparison to the quad core cpus.
If you're getting low fps(and similar) in all resolutions in that game, it's probably the cpu, you can try also to lower down the settings.
how can you choose between the two? I keep getting my fps dropped and i cant find why. i tried to run it. then it was working great after some setting sliding. then i plugged it up to my tv and it stunk. then i unplugged but the fps wont jump back up. its torture!!!! help me i7 8gb ram gtx 660 2gb
thats a confirmed cpu bottleneck, if you lower the resolution it is taking strain off the gpu and your limit is the cpu. from toms recent benchmarks, a fast quadcore i5/i7 is neded for good performance.