AMD vs Intel

Intel and AMD share a cross-licensing agreement under which:

• Intel lets AMD make x86 CPUs
• AMD lets Intel use its x86_64 instruction set

Both Intel and AMD processors have the same x86 architecture (having the same instruction set), but how the two companies implement that architecture (their computer organizations) is usually very different. The same programs run correctly on both because the architecture is the same, but they may run at different speeds because the organizations are different