Why has Cyrix changed the naming convention of the 6×86 chip from Pxxx+ to PRxxx+?
A. Cyrix changed the naming convention of the 6×86 from Pxxx+ to PRxxx+. PR simply stands for Performance Rating and not Pentium Rating. The folks at Intel are responsible for this change in meaning. They threatened Cyrix/IBM with legal action for naming their 6×86 processors Pxxx+. Intel thinks that they own the letter P and Cyrix/IBM responded by changing the name to PRxxx+.