3DMark03 measures performance by simulating DirectX 9 games, which are more recent games. The results you can see on the graph below.

In this program, Sempron 3400+ achieved a performance similar to almost all processors included in our benchmark. It was 4.54% faster than Athlon XP 2800+, 5.40% faster than Sempron 2800+ and 8.38% faster than Duron 1.8 GHz. It was slower only to Athlon 64 3800+, which was 5.01% faster than the processor being reviewed.