Intel Mobile Pentium III 800

Intel launched the Pentium 4 platform (for desktops) in November, 2000. However, the Pentium 4 wasn't suitable for mobile applications due to it's higher energy consumption. Intel still used the Mobile Pentium III at that time. The Pentium-M wasn't available until March 2003 so in the meantime CPU's like this 800MHz Pentium III, and later, Pentium III-M up to 1.33GHz, filled in the gap on the mobile market.

800MHz or 1.33GHz may not sound like much and yes, they weren't performance crowns. But don't fall for the 'MHz-myth': the Pentium 4 may have higher clock-frequencies but the Pentium III is more efficient per MHz. Depending on the application a 1.33GHz (Tualatin) may be faster than a 1.5GHz Pentium 4 (Willamette), and in some cases even match up to 1.8GHz or 1.9GHz Pentium 4 .