Quote - > Quote - > Quote - so in this link http://www.extremetech.com/article2/0,1697,2049694,00.asp are they a) comparing 4 cores with 2 cores

or are they

b) comapring 8 cores with 4 cores?

Core = 32 bit
Core 2 = 64 bit

I believe that is the biggest difference bet the two chips. Also Core Duo is dual core. Core Solo is single core. Core 2's comes in Dual Core and Quad Core configurations.