At first I didn't notice they also color-coded the graphs. For example;
Nehalem - Navy Blue
C2Q (Kentsfield and Yorkfield) - Cobalt Blue
C2D (Conroe and Wolfedale) - Blue
Pentium D (Smithfield and Presler) - Light Blue
It makes a lot of sense and helps understanding how the CPUs have been evolving for years. For example, we can see that AMD's 65nm was a total failure. It not only was slower than the competition but was also slower than its own 90nm predecessors. I always suspected that AM2 CPU's DDR2 controller was not up to par with the venerable Socket 939 CPU's DDR controller despite some hair-splitting reviews that attempted to show the new products in better light.
On Intel side, I can't help but pity my P-D 830 which sits in one of my drawers.

That poor thing would throttle at stock speed, even with an XP-90, to eventual lock-ups.