17 karma · joined October 26, 2019
"Recent technology nodes such as 22 nm, 16 nm, 14 nm, and 10 nm refer purely to a specific generation of chips made in a particular technology. It does not correspond to any gate length or half pitch. Nevertheless, the name convention has stuck and it's what the leading foundries call their nodes"
..."At the 45 nm process, Intel reached a gate length of 25 nm on a traditional planar transistor. At that node the gate length scaling effectively stalled; any further scaling to the gate length would produce less desirable results. Following the 32 nm process node, while other aspects of the transistor shrunk, the gate length was actually increased"
Transistor count plateaued. Moore's law died.
To avoid upseting and confusing consumers with this new reality, chip makers agreed to stop delineating their chips by the size of their components, and to instead group them in to generations by the time that they where made.
Helpfully, in another move to avoid confusion, the chip makers devised a new naming convention, where each new generation uses "nm" naming as if Moore's law continued. Say for example in 2004 you had chips with a 34nm NAND, and your next gen chips in 2006 are 32nm, then all you do is calculate what the smallest nm would have been if chip density doubled, and you use that size for marketing this generation. So you advertise 17nm instead of 32nm.
Using this new naming scheme also makes it super easy to get to 1.4nm and beyond. In fact, because it's decoupled from anything physical, you can even get to sub-plank scale, which would be impossible on the old scheme.
Edit: Some comments mention that transistor count and performance are still increasing. While that is technically true, I did the sums, the Intel P4 3.4Ghz came out 2004, if Moore's law continued, we would have 3482Ghz or 3.48 TERAHERTZ by now.
https://apnews.com/bd45c372caf118ec99964ea547880cd0
Actual temperature anomaly is 0.8 degrees. https://climate.nasa.gov/vital-signs/global-temperature/ So we're doing better than the best models predicted and we've massively increased co2 output beyond what those early modelers anticipated; Apparently those early climate modelers had not heard of China.