Overclocking my Athlon II x4 640

I dunno if I should really bother, but are there any preferable settings for overclocking this CPU?

It's a Athlon II x4 640 3.0Ghz, my Mobo has a OC feature in BIOS but I don't really know what settings should I mess with.

Anyone of You ever oveclocked a CPU like this one before and could share some light on the subject?

I got a new cooler installed so I'm not afraid of cooking the poor thing :)

basically you simply up the voltage and if temps dont spike ( a little voltage goes a long way) and the ramp up the cpu core clock manually in tiny increments no more than 50mhz at a time or 25mhz. since this isnt an unlocked cpu like the phenom II's dont expect a huge maximum core clock jump likely id be suprised if you hit 3.15ghz on air.