get a mobile xp chip. great overclockers and yes they work in a desktop environment. any questions look up the thread MVS made. i covered it there.
as for your original question get a barton core. i think they have the higher fsb and better core. but at this point why only upgrade this, and upgrade it so insignificantly? whats the rest of your system? im sure theres something else that could be improved upon and yield a better result.
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