One thing that caught me out and is worth reporting on is the DFI bios file name format.

I was confused why my C2D did not have multi adj until it was pointed out that i had the quad core bios version...

So DFI publish dual and quad core versions of thier bioses.

eg.
2CTST521 = Dual Core version of bios 521
4CTST521 = Quad Core version of bios 521