Actually since the beginning... they just didn't get popular traction at the time and stayed as internal codenames. https://en.wikipedia.org/wiki/Fahrenheit_(m

Actually since the beginning... they just didn't get popular traction at the time and stayed as internal codenames. https://en.wikipedia.org/wiki/Fahrenheit_(microarchitecture) https://en.wikipedia.org/wiki/Fahrenheit_(microarchitecture) https://en.wikipedia.org/wiki/Celsius_(microarchitecture) https://en.wikipedia.org/wiki/Celsius_(microarchitecture) https://en.wikipedia.org/wiki/Kelvin_(microarchitecture) https://en.wikipedia.org/wiki/Kelvin_(microarchitecture) https://en.wikipedia.org/wiki/Rankine_(microarchitecture) https://en.wikipedia.org/wiki/Rankine_(microarchitecture) https://en.wikipedia.org/wiki/Tesla_(microarchitecture) https://en.wikipedia.org/wiki/Tesla_(microarchitecture)