Article makes some wild claims.
E.g., "Obviously, 7nm chips would be even faster than todays 14nm processors and next years 10nm CPUs. Comparatively, a strand of DNA measures 2.5nm while a red blood cell has a 7,500nm diameter."
Maybe I'm off base. But to my knowledge feature size is just one component of processor speed.
http://www.extremetech.com/computin...its-of-smaller-processes-and-new-foundry-tech
And in this case, we don't even know what features IBM is claiming to have manufactured at the 7nm scale. Are we talking about source drain distance or some other dimension?
As for the claim that the chips are 4 times faster than what is currently on the market - that may be true but I will believe it when I see it. Particularly as the baseline for that performance claim (i.e., what was actually measured) was not provided. 4X faster transistor switching speed, while impressive, does not necessarily compute to a processor that is, overall, 4x faster than its closest competition.
Edit: ARS report is better and provides more detail -
http://arstechnica.co.uk/gadgets/2015/07/ibm-unveils-industrys-first-7nm-chip-moving-beyond-silicon/