I have been trying to get my 280 stable at something higher than 790 core clock, I have used nibitor to flash different vids to the 3d and extra setting all the way up to 1.4 volts. With more power I now get almost through Jane nash before I lock up. The problem is that I just lock up with now symptoms whatsoever, no artifacting or heat issues and so on. Hoping someone in here knows the symptoms. Oh yea testing at a 100 percent stable cpu/memory setting.