Here are invaluable links to help you in your quest:
Mobo ID tools
The Elusive Zen of Motherboard Identification - Link Updated [Article now hosted off-site]
BIOS String ID explained - Link Updated [Article now hosted off-site]
The links that state "hosted off-site" have been relocated due to the horrid load times on this server for the pages. The other links have database connections that I cannot replicate at this time. - Toby B.