Overclocking a 12GB set of memory should present some challenges but when playing with this set is was no harder to overclock than a 6GB set. I say that knowing it should take more QPI volts to stabilize the overclock than you might use with a 6GB set. All it took was the right combination of settings to reach the number. 1700MHz came without much fuss but 1800Mhz took an increase in voltage while maintaining the 9-9-9-24 timings. Moving up further required another bump to 1.65v and to finally reach 1974MHz (374MHz over the rated 1600Mhz) the timings needed to be relaxed to 9-10-9-27.