I have 2x4 corsair vengeance 1600 but it works on 1333. How to set on 1600? Mobo is asrock z77 extreme4. I found dram frequency it was on auto and i set it on ddr3-1600 but still works on 1333 (i saved and exit).
Did you go into the BIOS and enable XMP, then select profile 1 - if so and they are 1600 sticks then you should be running at 1600 - many programs however will show the true freq of 800