Template:mpu AMD-K6/PR2-166ALR was a 32-bit x86 microprocessor designed by AMD and introduced in early 1997. This chip was based on AMD's new K6 microarchitecture and was marketed as a 166 MHz Pentium II-equivalent processor. The PR2 rating was actually superfluous as the chip operated at 166 MHz anyway and performed just as well or better (AMD got rid of PR2 altogether in later models).