It's hard to believe 15 years have passed since I first tested the Pentium 4 series. Although it was a pretty rubbish series, I do have many fond memories of testing the Core 2 Duo range, which arrived six long years later, and included the most popular enthusiast processor we've seen yet, the Q6600. Today we're going to take a look back at the Core 2 CPUs and compare them to the current generation Haswell Celeron, Pentium, Core i3, i5 and i7 parts.