Q: what is 86x? thanks
A: x86-64 is a 64-bit superset of the x86 instruction set architecture. Because the x86-64 instruction set is a superset of the x86 instruction set, all instructions in the x86 instruction set can be executed by central processing units that implement the x86-64 instruction set; therefore these CPUs can natively run programs that run on x86 processors from Intel, AMD, and other vendors. x86-64 was designed by AMD, who have since renamed it AMD64. It has been cloned by Intel under the name Intel 64