As your fellow user indicates, if you can't touch the Vcore of the micro, you won't be able to do much overclocking. The multiplier of the micro is low, which is why older micros like the Q6600 are better for overclocking, because they have an FSB of 266 and a multiplier of 9, to give you an example.

It doesn't matter if you touch the voltage of the memories, the micro needs more power, more voltage, and you can't give it to him.