Quote:During much of its history, AMD has developed and produced processors patterned after Intel's original designs, but in a twist of computing history, Intel found itself in the position of adopting AMD's x86-64 architecture, which AMD had created as an extension to Intel's own x86 processor line. As AMD later renamed its architecture to AMD64, Intel in turn has renamed their implementation Intel 64. It is used in newer versions of Pentium 4, Pentium D, Pentium Extreme Edition, Celeron D, Xeon, and Core 2 processors.