x86 is the architecture, amd64 is an extention on that architecture so it’s still x86 just with an instruction set extension that allows for native 64 bit computing.

x86 was designed to be nearly fully backwards compatible back to the i386 or even the 8086 so whatever code that could run on those CPUs would work on modern “amd64” CPUs.

Pretty much x86 is a snowball rolling down a hill. It keeps picking up new things and growing as time goes on but the core of it will always be the same.

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It’s the HK G11 and FN P90. Both guns have a magazine where the cartridges aren’t in line with the chamber so each cartridge needs to be rotated before it can chambered. HK decided to commune with ancient clockwork gods to learn the secrets of kraut space magic while FN just went with a curved ramp.