NO, Duron has 100MHz FSB (200DDR) and 133MHz memory bus. In order to make it a fair competition, you should use a PIII with a 133MHz memory bus, which, for the PII, means you choose a processor with a 133MHz FSB, such as the 733EB, 800EB, 866EB, etc. And the PIII-EB does outperform the Duron in many games, because so many are SSE optimized. That's why, clock for clock, the PIII beats Athlons in 3DMark-2000. It also looses in certain applications, but the applications it looses are of less significance, because they are aplications that are executed so quickly by both that users cannot tell the difference. The only place you can actually SEE the difference is in games. And in many games, the PIII wins. You need a fast T-bird to beet the PIII there.
Cast not thine pearls before the swine