I'm using a 2500k on a vanilla p8p67 board.
Yes i know what you mean. I can get stable at load and idle(prime blend 8 hours) ,but when i am watching videos or something that starts to load the cpu at times , i get bsod's when the the core starts switching from 1600 to 4400 mhz and back ,seems the volts cant keep up . At least having constant volts would avoid this .
Oh well back to manual volts tommorow ...