[gampamu]

I agree with Psycho101 regarding your Vcore being conservative. My 1.25V VID Q6600 needs 1.3875V for 3.6G on my UD3P board. If the VID of your chip is higher, it's likely you will need more vcore than that.

Regarding the other voltage settings, I was able to get by with lower settings at 400x9: 1.2V VTT, 1.5V PLL, and 1.16V MCH using my 4x1G Kingstons. Higher voltages actually caused the system to be unstable.

Good luck.

Edit: I misread and thought you were running a Q6600. Regardless, I believe what I said above should be still apply to your E6600. There is often not much difference between overclocking the Q/E6600's, except the duo's can often manage a slightly higher FSB.