What is the difference between dual core 2nd generation and i3 first

do you means dual core 2nd gen = i3 sandybridge ? sandy bridge is much faster/better than first gen i3 if they are in same level/type/speed....
 



by dual core 2nd gen, he means celeron/pentium g i think


So its 2nd gen Celeron/Pentium G vs 1st gen i3