There may or may not be a registry edit for the 64bit version that is different for the one seen there. If you see the same values in the 64bit version this could be trried there. The fix there is shown as applying to
APPLIES TO
•Microsoft Windows Server 2003, Standard x64 Edition•Microsoft Windows Server 2003, Enterprise x64 Edition•Microsoft Windows XP Service Pack 2, when used with: Microsoft Windows XP Home Edition Microsoft Windows XP Professional•Microsoft Windows XP Tablet PC Edition 2005
This was the only article ever seen on a special reg edit for correcting performance problems. MSDN may have one for the 64bit version buried deep in there somewhere. Generally when moving up from a single to dual cored cpu a download of the latest bios version sees something like this corrected. The newer version offers the support for the higher end model cpus.
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