you *may* get some kind of benefit out of running a linux kernel built specifically for that processor but all in all you'll have the most compatibility and fewest problems using the release you have now (or switching to i686, which has fewer legacy components and should have new fancy crap like SSE instruction sets and such compiled in)
if you really want to throw caution to the wind, roll your own kernel out by installing the source on the computer and building it by hand...
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