@C-N: Ivy Bridge CPU specs require that the memory voltage stay within 5% of 1.50 volts.
Your Team Xtreem LV 2666 in comparison seems to require 1.65 volts (at the frequency you're running at).
One solution would be to replace with lower voltage memory, such as the 30 nm 1.35 volt 4 GB Samsung sticks.
Either that, or be happy with what your 1.65 volt memory can do.
Also note: the latest CPU-Z version is currently: 161.5