AMD Athlon XP 2600+
The Athlon XP 2600+ came in three versions and in my opinion this is the best one.
XP2600+ running at 2083MHz with 166MHz (DDR333) FSB and 256KB L2-cache.
XP2600+ running at 2133MHz with 133MHz (DDR266) FSB and 256KB L2-cache.
XP2600+ running at 1917MHz with 166MHz (DDR333) FSB and 512KB L2-cache.
This version runs at 2083MHz and uses the quicker 166MHz (DDR333) front-side-bus. AMD also released a version for the slower 133MHz (DDR266) front-side-bus, but this CPU lacks bus throughput. The third version is based on the 'Barton'-core and features 512KB L2-cache. It has a slower clockfrequency which affects performance and the extra 512KB L2-cache is not able to compensate this.