Not much between i3 and i5?

Got finished putting my 670 in, noticed there is only a .5 FPS increase between the it and the other build.

i5 2320 http://oi49.tinypic.com/ri93px.jpg
i3 2120 http://i.imgur.com/auGCk.png

I screwed up the other picture which is why the GPU is whited out, but they're both the same Asus Non Top 670 2GB. Could the lack of score difference show theres a problem somewhere? Or is it just because Heaven is designed primarily test GPUs rather than complete builds, so theres not much difference between CPUs?

Thanks.
 
Heaven is primarily GPU-bound :) I never notice too much of a difference between my brother's 560 Ti rig (running w/ Phenom II X4 955 @ 4.0) and my rig on Heaven.

Something like 3DMark should show the difference clearly :)