I think you'll find the reviews lean more towards the FX-57 because the 55 seems a bit anemic in comparison to the 57 or many of the dual-core processors,t he dual-core processors seem to be a good choice as well unless you are focusing on gaming. Multimedia applications seem to favor the dual-core.
Also, WinXP64 is said to have some driver availability issues. The only current advantage to it is the ability to address 64 bit applications down the road and access to over 4 GB of RAM, until games are 64 bit it's best to stick with 'vanilla' XP.
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I have gained this from philosophy: that I do without being commanded what others do only from fear of the law. - Aristotle
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