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#11
It`s a simple process of going into the bios and either setting the ram timing manually or using an XMP profile already setup by the ram manufacturer.
The DDR4 I just bought for my Z170 is advertised at 2666 MHz, but when installed it runs at 2133, I simply go into the bios and choose XMP profile #1, then save and exit the bios.
They also have a 2nd profile which runs at 2800 MHz, an added bonus for free (so to speak) :)
Most overclocked memory has to be set manually in the bios, totally normal.