I just checked, seems like it's the amd stock cooler and this one should be a little bit more capable of overclocking than intel's one. Just changing the multiplier and saving & rebooting, this isn't a way really. The motherboard will overvolt it for a certain frequency and you can run into heat issues. So you have to be very precise with the voltage. I would say test for now your temperatures with prime95 small fft's with coretemp as monitortool. Use cpu-z to check what the Vcore is like.
Give us the voltage during prime95 and your temps.