well i had a look at the intel site and saw it listed under the desktop section as you said.....but with this description
The Intel® Core™ Duo processor is the next-generation processor in the latest Intel® Centrino® mobile technology-based notebooks and delivers revolutionary dual-core mobile performance and great power efficiency.
i can almost guarantee you someone screwed up with regards to however you found out its a "core duo". unless there is actually a desktop board for them now or they have been ported to LGA775 you must have a Pentium D