Bing found these results
x86-64 - Wikipedia
x86 instruction listings - Wikipedia
x86 - Wikipedia
What is x86-64? | Definition from TechTarget
x86 Assembly/X86 Architecture - Wikibooks
x86 calling conventions - Wikipedia
64-bit computing - Wikipedia
x86 assembly language - Wikipedia
x86 - Simple English Wikipedia, the free encyclopedia
X64 - Simple English Wikipedia, the free encyclopedia