amd64 is the name for the architecture that both intel and amd use in their 64-bit desktop processors. It has that name because it was originally amd that released the architecture (and intel used itanium at the time).
And those are usually mean old bearded Unix old-timers that will strike down upon thee with great vengeance and [condescending] anger.
And you do not want to upset these people.
Disclaimer I'm a young Unix old-timer, currently growing a beard.
* almost everyone who cares