How AMD Saved The Modern Computer
While Intel invented the x86 architecture, it was actually AMD that created the 64-bit version we use today. Most modern PCs, including those with Intel chips, run on AMD's legacy design.
In the early 2000s, Intel tried to replace x86 entirely with a new, incompatible architecture called Itanium. AMD took a gamble by simply extending the existing x86 design instead, which allowed software to stay compatible. This move proved so successful that Intel eventually had to adopt AMD's standard for their own processors. Today, almost every desktop and laptop runs on this clever bridge between past and present.
Source: X86-64