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Intel owns x86, AMD owns x64. Which is funny.
Intel tried to make Itanium which was incompatible with x86 in order to become a monopoly, but AMD extended x86 with x64. AMD won in the end due to adoption, their first chip was the original Athlon64, which came shortly after the pentium 4 and the ghz wars.
Intel had a rough time of it then, the Itanium and Pentium 4 were both dead ends design wise.