Your question is more specific to a processor and I would encourage you to post your questions regarding CPUs in our Processors' Community (http://communities.intel.com/community/tech/processors).
Furthermore, Xeon CPUs with the frequency of 3.66GHz, there are only two CPUs listed with sSpec #: SL84W and SL8UN, both of which are processed under 90nm manufacturing technology with 667MHz FSB however I am not very sure that either of them support HT and are 64Bit CPUs.
The list of Xeon CPUs that support HT and are 64Bit is as follows: http://processorfinder.intel.com/List.aspx?ParentRadio=All&ProcFam=528&SearchKey=
However just to ensure that either CPU supports 64Bit or HT, you can contact the support team via following channels:
Phone Support: http://www.intel.com/support/9089.htm
Thank you and have a nice day!
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