If stable and temperature cool is good overclock
how? hes over intels max rated voltage and his volts are above what he should have to run.
you should only have to run in the neighborhood of 1.485volts at the speed.
the formula for voltage is roughly .03x where x is your multiplier. that is just a rough estimate but at around 48 its 1.425 +- .03 for every 100mhz up or down.