We test DDR4 memory with the ASUS Maximus VIII Impact motherboard and an Intel Core i7 6700K processor. The clock speed and uncore of the processor are set at 4 GHz, with turbo mode turned off. In the graphs we compare the kit with the sets from our last big test. We only tested two modules if we were testing a quad-kit, since the Impact only has two memory slots.
Initially we run our tests at XMP settings, in other words the standard speeds of the modules. Then we try to achieve higher speeds by upping the voltage. Lastly we also try to optimize the timings to achieve scores that are as high as possible.
Overclocking memory generally isn't very useful, since performance gains from faster memory tend to be small. There are quite a lot of enthusiasts that do this purely for fun however.