Interesting that the article mentions SNB, because since then the gains in performance have been much smaller. SNB was the last "significant" gain in performance for Intel CPU's I'd say (+35 percent over previous generation). All of the new generations since then have gotten like 10 percent increase in IPC, at best, and Broadwell will probably get a max gain of +5 percent.

To "hide" this, Intel has refocused its marketing on power consumption, where gains seem easier to achieve (for now), as well as other pure marketing tricks such as calling what used to be "Turbo Boost speed", the "normal speed". I've noticed for example recently a Bay Trail laptop being marketed at "2 Ghz", even though Bay Trail's base speed is much lower than that.