Ultra-D NF4 settings for Opteron 165

I have an Ultra-D NF4 with an Opteron 165.

I tried just going into the bios and setting the fsb at 250 and windows would not boot, at 225 it booted fine.

I know it can go higher than 250 but I have no idea how to overclock this thing.

I can't seem to find a thread on how exactly to overclock these things.

My memory is pc3700 kreton (if that matters).

I don't want to touch the voltages just yet.

Duh just realized I had to set the divider manually.

yea i have my 165 opty at 2.7 stable. once i get better cooling it will go up alot more.