no no i have elpidia XD and have 785khs with engine 1125 and memory 1750, the hinix don't work so fun, have 78° with 725khs, over vdcc i think 
Would you mind sharing all of your settings (copy / paste arguments) please? Also you mentioned about voltage, are you using Trixx, or something else? And you're using the same bios I uploaded?
thanks!