you could start by going into your bios, "soyo combo feature" menu, and upping your "cpu frequency mode" to, say, 150mhz and change your "cpu to pci divider" to 5. save this and try it for a while and see if it's stable and watch your temps.
if after some testing/game-playing all is good, then go back and add some "frequency 1mhz stepping" to bring it to like, 158mhz. try that for a while. basically, just see how high you and your computer feel comfortable with.
EP, glad to see you come back and tidy up...did want to ask a one day favor, I want to enhance my resume , was hoping you could make me administrator for a day, if so, take me right off since I won't be here to do anything, and don't know the slightest about the board, but it would be nice putting "served administrator osnn", if can do, THANKS