Swapped my 8Gig kit for a nice 16Gig Team Xtreem 2666 C11 1.65v as I needed more then 8Gig. Figured I should be able to hit 2133 or at least 1866 as a bonus. Problem is I can only do 1600. Now I can do it at 8-8-8-24 1T with all volts set to auto and Dram volts at 1.65. But, 1866 and up just causes it not to post a few times then it boots at 1333. I have tried 1866 at 14-13-13-35 2T with VCCSA at 1.105, VCCIO at 1.25, and Dram volts at 1.7 without any success. The CPU is not overclocked at all with everything set to auto / default for these tests. Is there anything I am missing, or am I just out of look. I guess 1600 C8 is OK. Just expected more from them as I couldn't find any case where someone couldn't run a Sandy Bridge above 1600. So, if anyone remembers any secrets to overclocking ram on an old Sandy Bridge let me know.