
thumb|AMD Opteron, the first CPU to introduce the x86-64 extensions in April 2003 thumb|right|The five-volume set of the ''x86-64 Architecture Programmer's Manual'', as published and distributed by AMD in 2002
thumb|AMD Opteron, the first CPU to introduce the x86-64 extensions in April 2003 thumb|right|The five-volume set of the ''x86-64 Architecture Programmer's Manual'', as published and distributed by AMD in 2002
x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit extension of the x86 instruction set. It was announced in 1999 and first available in the AMD Opteron family in 2003. It introduces two new operating modes: 64-bit mode and compatibility mode, along with a new four-level paging mechanism.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).