We had a very trying time overclocking this set of memory. At the stock voltage and timings we managed to only squeeze out another 40MHz over the stock 1600MHz. Was I disappointed? Not at all, because again we were only running at 1.35 volts. The name of the game with this kit is extreme low voltage.
Cranking up the voltage to the Intel specified limit of 1.65 did see a more impressive boost in megahertz. We managed to get 1852MHz at 8-8-8-24, but increasing the timings to 9-9-9-28 did not yield any jump into the BLK.