Software running in a non-x86 machine (non-PC) that runs applications written for an x86 machine. x86 emulators were first developed to run 16-bit DOS and Windows 3.1 applications, and later, 32-bit ...

A computer system that is based on Intel's x86 family of CPUs, which includes Intel's Core and Pentium lines and AMD's Athlon, Opteron and Sempron families. See x86 and x86 compatible. THIS DEFINITION ...

I'm thinking that all of the low hanging fruit of increased performance gains has already been picked for x86. Meaning that even through future CPUs will be faster, most users wouldn't notice.