This series of benchmarks compares the Athlon XP 2500+, the Mobile Athlon 2500+, and the Sempron 2500+.

We put all three 2500+ rated chips through a plethora of performance benchmarks in order to see which of the three will give us the best performance for our dollar straight out of the box.

Now there is mention that the Sempron 2500+ rating is actually in comparison to relative Intel Celeron CPUs (since they are after all it's main price point competition), but after years of having AMD promise me and the world that it's performance rating system was based on some mythical Thunderbird processor and NEVER the competition I don't buy it. You're not allowed to rate two chips at identical 2500+ speeds without so much as an asterix and then tell that they're not supposed to perform similarly. The same goes for the Mobile Barton Chip.

http://www.hardcoreware.net/reviews/review-239-1.htm