i saw 2.8V is the MAX you should push DDR if you do not want to risk killing it.
3.0V is asking for trouble... that is a 20% incress in voltage.
and the benifits of raising the voltage quickly disapear in the 20% inccreass of voltage range.
10% is gernally safe
10%-15% a risk becomes greater
15-20% high risk of dead RAM and more voltage does little to help more speed.
20%+ you better have some good cooling, and the risk is VERY high of killing hardware