Hi, id like to know why my corsair vengeance ram underclocks itself to 1333 mHz and when I try to return it to 1600 mHz, i get a boot failure. It then resets it to 1333 mHz. The same happens when I try to edit my cpu frequency. This board was not bought brand new but it was bought second hand about a month ago and is no longer under warranty. The vengeance sticks are from different sets too. One is from a 3 stick set and one is from a single stick set. They are both similar and i dont know if that matters. I have tried re flashing the bios but no such luck in fixing anything. Any help is greatly appreciated. Thanks