i have a core-santiago (P5S800-VM), and i want to upgrade to a dual core processor. im not sure it will work my machine, here is a link to my stat page about the pc im using copy & paste
http://support.packardbell.com/uk/item/?sn=049507720402&g=1400
http://support.packardbell.com/uk/item/?sn=049507720402&g=1400