Intel Pentium II die shot, image from IntelOn the 7th of May in 1997, Intel launched the Pentium II. Intel Pentium II package, image from IntelThe Pentium II was made of 7.5 million transistors on a 350nm CMOS process. Intel Pentium III die shot, image from flickr user Fritzchens FritzOn the 26th of February in 1999, Intel launched the Pentium III built of 9.5 million transistors on 250nm CMOS process. Pentium III E die shot, image from flickr user Fritzchens FritzThe Pentium III was quickly followed by by a more powerful version on the 25th of October in 1999. These Pentium IIIs are often referred to as the Pentium III E as when an original Pentium III and new Pentium III featured the same clock speed, the newer chip was suffixed with an E. As for those speeds, they were 500MHz, 533MHz, 600MHz, 650MHz, 667MHz, 700MHz and 733MHz.