every cpu is different and can overclock farther than others and some take a lot of voltage which produces heat. Id start small by going to 3.5ish on stock voltage, and go higher on stock voltage until u hit a wall, then slowly raise voltage until u hit another wall and then thats prob ur max before temp testing. Being a black edition cpu all u need to do is raise the multiplier. that cpu has a 16x200 so move the 16 to something higher or u can raise the fsb the 200 which will change ur ram, chipset freq which can some times not allow for higher overclocks.
Basically raise multiplier at stock voltage until a bsod then raise voltage to see if u can get farther and continue until temps or voltage gets to high or a bsod, and make sure temps are reasonable, and is stable with prime95 or intel burn test. Make sure u have an accurate temp reading as amds readouts tend to be a little off, and average oc for the phenom IIs were around 3.8-4.2, 4.2 usually being max. Safe temps around 60c, and voltage high of 1.5v. NOTE: GO IN SMALL INCREMENTS, go in small increases with the clock speed and voltage and double check settings as at least my board can go farther than 4.5ghz and 1.5v where as i dont have the cooling and stuff for that kind of OC
My x6 which is non BE is sitting at 3718Mhz at 1.35v, which is from using my boards auto OC and i can hit a little higher around 3860mhz ish but with quite a bit more voltage
That board seems good for overclocking at least the vrm desgin except theres no heatsink, so either add an aftermarket heatsink to them or make sure u have sufficient cooling as the liquid cooler supplies no airflow around them.