Actually... You cannot compare an Athlon 2500+ with a Sempron 2500+; the former is based on a (flawed) P4 comparison, while the latter is based on a Celeron (4) comparison - that's quite a differenc!
You can however compare clockspeed. As Skaven said: they're essentially Athlons, so a 1800 mhz athlon should be as fast as a 1800 mhz sempron.
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