Oh! One thing though. Ivy Bridge DOES NOT like voltage.
Start by dropping the voltage to 0.9v and then see if you get stability.
Then increase the multiplier, upping the voltages as you normally would.
Test system after each jump in V and MP.
Just remember to disable all power saving.
I also suggest to start the OC with fixed mode. Not offset.
This explains it if you already know what you are doing : http://www.thinkcomputers.org/intel-ivy-bridge-overclocking-guide/