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They're 64-bit variant of x86, or x86-64. x64 is a shit name and people should stop using it. Sadly that probably won't happen thanks to Microsoft.

In fact, the term "x86-64" came into existence as a term-of-art because "x64" technically refers to the Itanium ISA (Intel's first now-forgotten attempt at a 64-bit ISA), not the IA64 ISA (Intel's canonicalization of AMD's unofficial extension to IA32.)

The most correct term is "amd64" IMHO.

Uh, "IA-64" is Itanium. Intel officially calls x86-64 "Intel 64".

Yeah, Itanium is IA-64. It's also dying but not forgotten: people who like RISC, reliability, security features, and high-speed all in one remember their vain attempt well. Are also reaping benefits of used HP Integrity and SGI Altix boxes on eBay selling cheaper than consoles. I'm eyeballing a few of those suckers myself. :)

"x86" refers to the family of instruction sets, including the 16, 32, and 64 bit variants. https://en.wikipedia.org/wiki/X86

Stop being a cpu architecture name nazi.

If you really want a name, just call it "the architecture that Intel made in te 70ies, with a lot of weird stuff (like 20 bits addresses) and that Intel, itself, tried and failed to kill with Itanium."

That's wrong - not all of them run Microsoft Windows.