What kind of cooling are you using?
It has been my experience that the Amd chips OC better over time. You will be able to OC higher in 2 months than you can next week.
For the best info on OCing, check in the OC forum.
Star simple. Reduce your HTT multiplier to 4, and increase the base rate from 200, to 220. Run it that way for a month.
If you are using DDR400, you may have to lower your ram to 333. (the 220 base will raise it to 366, while @ 400 rate, it would have to be able to handle DDR440 speed.)