my board is some what diffrent to all yours mine has 4 gtl ref which i got told to set all to 85 which seems to do the trick getting to 4.2 stable on 780i chipset is quite rear on a quad. all i do if you want to save some time and power is run 50 IBT then if its 100% you will never have a problem. are you running ddr @ your 4.2 6 runs in IBT my times are like 640 seconds where yours are 552?