This is the guide I used: http://www.tomshardware.com/forum/263043-29-1156-core-core-overclocking-guide
I started out by using the LOWEST RAM multiplier. Then I increased the bus speed in small increments. I had to raise the voltage slightly to prevent BSOD. Ended up with 1.270 Volts; very stable, and good temps. - I didn't have to tweak anything else, but made sure that the resulting settings were within specified limits.
At a higher RAM multiplier, the RAM frequency went beyond the designed 1,600 MHz; that's why I lowered the RAM frequency such that the RAM speed was 1,452 which is within the stated 1,600 MHz frequency.
I used EVGA's ELEET as a guide when doing all this, and made sure that no setting was over the limits. Very conservative approach.