Case in point, you could get bipolar ECL RAM in the 80s with access times of around 1-2 ns (which is at least four times faster than the fastest DDR-SDRAM in 20

Case in point, you could get bipolar ECL RAM in the 80s with access times of around 1-2 ns (which is at least four times faster than the fastest DDR-SDRAM in 2020). Except those things would have a few kilobits at most and burn a Watt or two; an entire 16 GB stick of DDR4 doesn't require much more than that. (This is SRAM of course; you can't build good DRAM on a bipolar process, and MOS SRAM is much faster than DRAM as well. However, MOS SRAM in the 80s would have access times of 20-150 ns; it's typically the suffix of the part number, e.g. 62256-70)