Check my sig.
Here are the raw numbers I used.
Multiplier (locked) = x 10
CPU Frequency = 250
Vcore = 1.44V
Memory Clk = Auto
This yielded results similar to what is in my sig.
All of the settings will be found in the "Advanced" tab of the BIOS
A High Performance HSF (Heat Sink Fan) is generally recommended, though there are individuals that achieve impressive numbers with stock cooling.
NOTE: Do Not go straight to 250/1.44V. Increase in increments of 5 (205...210...215, etc.) and .005 V (1.375....1.380....1.385) TEST after each increase, adn check the results of the CPU and the RAM with a utility called CPUz (free download).
Once you start getting up past 230 you might want to run Prime95 on both cores for 12 hours to ensure stability. In order to put a load on both cores follow these instructions, though you might want to familiarize yourself with Prime95 first.
Overclocking is a RISK! Make no mistake, like gambling do not put more on the line than you can lose.
Patience is paramount. Oc'ing safely can be a time-consuming task, but stable results are worth the effort.
Also, you might want to stay away from .5 increments in the Multilplier; a moot point if you are staying at x 10
I hope that this helps.