This says you've got a springdale motherboard. http://www.google.com/search?q=springdale+motherboard shows many manufacturers.
So the next steps could be things like:
1. Check the manuals that came with the PC.
2. Check the bill that came with the PC (if a custom made one).
3. Open the case and look for clues.
4. Run the CPU-Z program recommended in the post above yours.