Video, audio encoding
Encoding audio files into MP3 format is a specific task as it but slightly depends on the memory speed or the size of the L2 cache. That’s why the overclocked Sempron 3100+ is much faster than the Athlon 64 3400+, but not enough fast to outperform the 3.4GHz Pentium on the Northwood core.
The size of the cache and the speed of working with the memory are of little importance at encoding “raw” video into MPEG-2 format, but Intel’s CPUs benefit here from the support of SIMD instructions, including a fast SSE2 unit and SSE3 support. The result of the Sempron 3100+ is anyway good compared to the Athlon 64 3400+ - the high clock rate helps a lot in this test.
The same goes for this test – encoding video into MPEG-4 format with the DivX codec.
When using another codec (XviD), the overclocked Sempron 3100+ only loses to the Prescott-core Pentium 4.