Windows XP 64-Bit Edition beta doesn't support Nocona
Spinner
Birmingham, UK
Customers can now purchase workstations using Intel's Nocona Xeon processor, with 64-bit extensions to the x86 instruction set, but they can't run the beta 64-bit version of Windows designed for those extensions on the new workstations.
Source: InfoWorldA beta version of Windows compatible with Intel's 64-bit extensions technology is expected to be released by the end of next month, according to sources close to Microsoft. Intel is planning to introduce a server chipset for its Nocona Xeon processors in August, right around the time the new beta version is expected.
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Comments
Marc is correct. The release of 64BE was delayed because Intel wanted to retool their Xeon CPU for what is apparently "The slowest implementation of X86-64 the world has ever seen."