x86-64 (also known as x64, x86_64, AMD64, and Intel 64) [note 1] 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.

Nov 7, 2025 · Learn about x64 architecture: a backward-compatible extension of x86 with 64-bit registers, calling conventions, and addressing modes. Get started with x64 programming.

Jul 23, 2025 · x64 is a 64-bit structure that extends the x86 structure. The time period "x64" is frequently used interchangeably with "x86-64" or "AMD64" because it became advanced with …

Nov 29, 2024 · Now, term x86 refers to a 32 bit CPU and operating system for 32-bit processors (80386 and 80486), while term x64 refers to 64 bit CPU and operating system for 64-bit …

Jul 20, 2022 · What is x64 Architecture? x64 (short for x86-64) is an instruction set architecture based on x86, extended to enable 64-bit code. It was first released in 2000, introducing two …

Mar 29, 2024 · In this guide, compare the differences between x86 and x64 processors and how to check which you're running quickly via the terminal.

Nov 13, 2023 · x86-64 (also called x86_64, x64, or amd64) is the 64-bit CPU architecture that is used in Intel and AMD processors. It is an extension to the 32-bit x86 (i386) architecture.

May 25, 2024 · x64 Architecture: Also known as x86-64 or AMD64, the x64 architecture was introduced to overcome the limitations of x86. This 64-bit architecture supports significantly …

Mar 20, 2025 · This article explains the main differences between x86 and x64 processors and how they affect how your computer works and runs applications.

Jun 14, 2024 · x64, also known as AMD64 or x86-64, is an extension of the x86 architecture that introduces 64-bit computing capabilities. Developed by AMD in the early 2000s, x64 has since …