I think your system is plenty fast enough. Even an imbedded graphics chipset sould do better than 15fps. AMD uses HyperTransport for its interconnects, not a FSB, and has its memory controller on the processor.

It appears that the game you're playing gets its config info from a couple of files instead of letting the OS handle the resources. It won't matter what you do to the OS or hardware if the software is limiting itself.

It would be helpful if you could identify the specific make/model of your system.