Need a bit of advice to get me to 2.8GHz with my x2 4800+.

I have so far got it stable (13hrs prime) at 2.70GHz ~246x11~ at 1.43v (-bios reading | 1.45v cpuz). I am currently having a go for 2.8 but having a tough time achieving stable prime along the way...

I think i am starting to get somewhere though, cause for the first time, after some tweaks, i am so far a half hr prime stable at 2.75MHz. Up till now i think my MB was not able to handle 250mhz fsb but i just upped the chipset voltage to 1.6v. At the same instance i also put my memory voltage to 2.85v. It obviously worked, well at least is lasting longer in prime so far than it ever has at this fsb. However of course i don't know if it will actually pass prime 12hrs though... What do you think? Am i on the right track, or do you have any suggestions?

Cheers.