Overclocking suggestions?

[Sunni_Phono]

Athlon 64 3000+
DFI Lanparty UT
512Mb Crucial Ballistix
550 Watt antec PSU
9800 Pro

I am running extremely stable at these settings so far...

225 FBS, 1:1 @ 2.5-2-2-10 timings, 2.80 vDIMM.

Seems like I can't get the divider to work. I want to try and run a 9/10 divider, but when I get it into windows, CPUz doesn't show what the ram speed is, it's just blank. Also I can't get the computer to boot when I up the vCORE for some reason. Don't know why.

any suggestions? I would like to get to try and get to 240 - 250 FSB.