The system memory multiplier is able to set according to your needs. I will be set it at 3.33 where the memory frequency will be running at 667MHz for the testing later.

While the memory voltage can be set with the increment of +1V until +6V. Which brings the default of 1.8V until 2.4V.

In the MB Intelligent Tweakers( M.I.T ), scroll down to the lowest part is the M.I.B.2 feature, Select "Enabled" to activate M.I.B.2 function and select the Vendor/Brand of the memory chips.