See? I told you. They are just Athlon XPs with a facelift...
'"There is overlap between the two product lines," said Bahr Mahony, a mobile marketing manager with AMD, who conceded that, in some cases, the Sempron processors could be the same die as Athlon XPs, specified at different clock frequencies.' - eetimes.
OK, maybe I am exaggerating a little: the on-chip cache sizes are different, as well as some other differences in quality. Still, don't expect anything radical from this chip. But then, its not meant to be...