Bought two kits of these for my 1155 build. I needed blue memory to match my color theme. I honestly should have bought something else though. These sticks won't go over DDR3-1680, at all. I've tried 1700 (using both my 1600 and 1866 dividers), and even that won't go stable. I can't even POST at 1866 with any timings or voltages.
I've tried each individual stick even (one at a time). Not a single one of my sticks (4 total) will do 1866 at all, regardless of timings or volts.
I wouldn't buy these sticks again, even if they were free. They work at stock, but that's it.