The motherboard ought to under volt and under clock it automatically to a safe voltage of 1.5 V and a slower frequency, this frequency will be 1600 MHz as can also be seen on the website of ASUS http://www.asus.com/Motherboards/MAXIMUS_VII_HERO/specifications/ , all the other frequencies are OC and should be altered manually in the motherboard. If this is not the case and the pc actually starts with full frequency and 1.65 V you can always just undervolt the RAM module by changing its timing which is relatively easy in the new ASUS UEFI AMI BIOS. I have a ASUS H97 ME mobo with an Intel core i5 4590, and the mobo automatically under volts and reduce the frequency of my Kingston stick from 1600 Mhz to 1333 Mhz and from 1.65V to 1.5V which is safe for all Haswell CPUs.