Dual Core CPU review: http://www.xbitlabs.com/articles/cpu/display/dualcore-shootout.html
Quad core: Core 2 Quad Q9300 vs Q6600: http://www.xbitlabs.com/articles/cpu/display/core2quad-q9300.html
Dual Core CPU review: http://www.xbitlabs.com/articles/cpu/display/dualcore-shootout.html
Quad core: Core 2 Quad Q9300 vs Q6600: http://www.xbitlabs.com/articles/cpu/display/core2quad-q9300.html