No, but with all CPUs, as with all DRAM, some come off the line stronger or weaker than others........Asus just did sort of a study on the 4770K CPus and their findings were that only about 15% could hit 4.8GHz or so, about 30% of all could hit 4.7GHz, etc, etc and it's true of many components - you might see it referred to as 'luck of the draw' or 'luck of the silicon'