[lefty-lie-spy]

300mm (30 cm or 11 inch transistors / microprocessors) are, well, pretty much late 1940s / early 1950s technology, no?

[Spktyr]

300mm refers to the size of the silicon wafer on which the chips will be created. A 300mm wafer will yield 640 ‘dies’ or individual chips per wafer.

https://en.wikipedia.org/wiki/Wafer_(electronics)

[Yo-Yo]

After asking Google, 300 mm is the diameter of the silicon wafer used to make the chips. The number of chips that can be made from a 300 mm diameter wafer depends on the size of the individual chip dies.

[Spktyr]

Silicon wafers don’t show up until 1960....