The “nanotube computer... runs 32-bit instructions on 16-bit data and has a transistor-channel length of roughly 1.5 μm. It can therefore be compared to the silicon-based Intel 80386 processor, which was introduced in 1985 and had similar specifications.”https://www.nature.com/articles/d41586-019-02519-2 …
This write-up goes into more detail: http://news.mit.edu/2019/carbon-nanotubes-microprocessor-0828 … (Note that this is news from August of last year.)