CPU for choosing:

i3-380M       2 cores   4 threads   2.53 GHz     Intel® Core Graphics

i5-560M        2 cores   4 threads   3.2 GHz     Intel® Core Graphics

i3-2350M      2 cores   4 threads   2.3 GHz     Intel® HD Graphics 3000

i5-2520M      2 cores   4 threads   2.5 GHz ~ 3.2 GHz     Intel® HD Graphics 3000

i7-2640M      2 cores   4 threads   2.8 GHz ~ 3.5 GHz     Intel® HD Graphics 3000

i3-3110M      2 cores   4 threads   2.4 GHz     Intel® HD Graphics 4000

i5-3320M      2 cores   4 threads   2.6 GHz ~ 3.3 GHz     Intel® HD Graphics 4000

i7-3540M      2 cores   4 threads   3.0 GHz ~ 3.7 GHz     Intel® HD Graphics 4000