There is no difference between EM64T & Intel 64. Both are the same.
Intel first introduced their 64-bit processors under the technology name EM64T. Later they changed it to Intel 64.
So regarding your question, you processor supports EM64T i.e it is Intel 64.
For information on 64bit & EM64T, chk this link:
*en.wikipedia.org/wiki/EM64T#Intel_64
Regarding your processor supporting the 64-bit Technology, chk these:
*www.intel.com/products/processor_number/chart/pentium_d.htm
*compare.intel.com/pcc/showchart.aspx?mmID=881356&familyID=1&culture=en-US