I thought the maximum voltage for an L2 stepping was 1.5V:
http://processorfinder.intel.com/det...px?sSpec=SLA3H
The RAM is running at 690MHZ and is 800MHZ DDR2.
Tried lower voltages and it was not IBT stable.
I tended to use relatively modest voltage increases when I was overclocking my E4300 and Q6600 though. However the E2160 cost me less than £15 IIRC so I want to see how far it can go.