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So what does the 1nm refer to? Is it just a marketing term for an improvement of x from 4nm?

• adrian_b 5y ago
  Precisely that. In the beginning, for every doubling of the transistor density, regardless how that was achieved, the marketing size number was divided by about sqrt(2). More recently the relationship between the density improvement ratio and the marketing size seems to be even less quantitative. So they might claim that their process is 4 times denser than in the recent IBM announcement or maybe that it is just twice denser, if they have divided 2 nm from IBM by 1.4 and they have rounded to 1 nm. Similarly, the IBM "2 nm" announcement was probably intended to claim that it is twice denser than the older announcement of the "3 nm" TSMC process.