i think this site will have what you need

http://www.bekkoame.ne.jp/~t-imai/maine.html

just click on Mac tuneup and select the Mac of your choosing. when you choose B&W or PCI G4 (at least i think your talking about a B&W, correct me if i am wrong) the first page will show you the jumper settings, and the next page is if you want to try to take things a step further by over-clocking the system bus.