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From everything I read in response to the request. SP2 changes how the OS handles dual core processors. The XP Home OS is still multi-threaded and has been able to be run on HyperThreaded processors fine. XP Home has limitations as far as Physical processors and that is just a licensing thing (just just ignore the other processor), but for Dual Core, it treats it as a physical processor, and uses both the cores. I can't find more information from MS than what I gave, so I can't really provide more information. However, the XP Home limitation is not a physical limitation of the OS, its a licensing issue.
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