Good luck finding out.
I Googled it, and ended up with the eMachines' page for it, J&R's page for it, a pdf file, and a cNet article. None of these said what it was. In fact, they stats given varied from 2.0GHz to 2.2GHz, 3200 to 3400.
By comparing on NewEgg, I'd say that it is a socket 754 3200 Newcastle.
But, according to the pdf (http://www.cyberscholar.com/eMachine...sheet_6410.pdf
) it has dual-channel memory. If it is correct, then it would probably be A Winchester, but there could be the possibility of a Venice in there.
If you get it, run Everest and let us know.