Comparisons of two older notebook CPUs

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I'm having trouble finding -relevant- results in Google to the question
"what is different between an AMD Athlon XP-M 2800 Mobile and an AMD
Sempron 3000+ processor" (core clock, L2 cache, processor features).

Basically I am trying to decide which of two sealed computers I should
keep, and which should go up on eBay. The peripherals and other
features (at least the ones I care about) are comparable, although the
XP-M machine is a regular notebook and the Sempron is a thin-n-light.
Since both use PC2700 RAM I am guessing both run at FSB=333MHz.

When I google for info, the results I get are polluted by people
talking about desktop systems and I don't think the mobile versions of
these processors are the same.

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