> Another important factor to consider however, is that the Maxwell and Fermi architecture (Maxwell 900 series; Fermi 400 and 500 series) are quite a bit faster than the Kepler architecture (600 and 700 series);

Where are the citation for this? I have heard about the disappointing benchmarks when the 600 serie launched, but this is uncommon as far as I know in the GPU marked to have sub part drivers on launch. Plus if you are following a tic-toc strategy like Intel does, you should rarely go for the tic iteration in my opinion. So is this just a claim from the author or is there something to back this statement up?