AMD Athlon 1GHz, 950MHz, 900MHz

UnrealTournament is very memory intensive as well as being a good CPU benchmark. The benefits of the Pentium III's full speed on-die L2 cache can be seen here where it, at 800MHz on a 133A board, performs within 0.3 fps of the 1GHz Athlon. One thing that is worth noting is that the Athlon 900 with it's slower 300MHz L2 cache just barely outperforms the 850MHz part with 340MHz L2 cache.

For the first time in the entire comparison the 1GHz Athlon falls behind the two RDRAM equipped test beds, this is the perfect illustration of what RDRAM's incredible bandwidth can do when coupled with the full speed L2 cache of the Pentium III.

From a price to performance ratio standpoint, the Athlon at 1000MHz would still be a better value than a Pentium III 733/133 on an i820 setup because of the sheer cost of RDRAM.