[First Look] DFI 680i LT NF-680i LT SLI (56K Warning~~~)

[Raja@ASUS]

memtest and prime are 2 entirely different beasts, and passing in one will not guarantee passing with the other. Just stressing one area of the board at a time never guarantee's stability upon simultaneous load of CPU, memory and pcie lanes. I don't run prime anymore, as I can generally dial in where I can run 24/7 without it, part of what put me off was looking back over prime history to realise the code has needed slowing down or speeding up based upon new topologies, and at times the changes were not made fast enough. That being said the shutdown issue is something I have seen myself, your best option is just to OC that processor by feel of what you run day to day, once you have been oc'ing for a while, it's not too difficult to do..