Hiker, check my sig, i have basically the same mobo & CPU. to get 3.0, all i did was up the FSB to 333, set the RAM to 667, set the CPU voltage to 1.35 and turned off speed step. I was later able to get to 3.6 without one single issue, but that is a different story, hope this helps.
Also, is your CPU a B3 or G0 Chip?
Thats great ill go try that now, it's a GO chip..