Well, just try to o/c it without changing voltages, and if you start getting boot problems and instability, then slowly put the voltage up. Yes it will create more heat but can help your stability at higher speeds. My celeron is running at 1.675 up from 1.475 and runs about 5 or 6 degrees hotter. I'm not sure on how amd chips tolerate voltage but i wouldnt push it too much higher than 1.8v for your chip. Yes it will shorten the life of your cpu, but not anything significant if you are upgrading in the next couple of years.