Maybe you want to chck out the thread at XTremeSystems about the ITK. I've downloaded it, but I haven't used it yet--they at least allow you to change your FSB and processor multipliers for the D945GPM board.
Looking to me like a lot of the options shown there are not available for the D945GPM, but hopefully we can get somewhere. If anybody tries this with the D945GPM, please let me know what works!
I'm personally running a D 930.