I watched your video and I face with the same problem : by using Displayport, the display becomes black randomly when I apply about 1.35 V with ASUS GPU Tweak or +160mV with Sapphire Trixx. On the other hand, with DVI, instead of black screens, the display flickers, becomes blurred randomly. I must diconnect the DVI cable to have a crisp image.
I am watercooled : the GPU does not exceed 45?C and the VRM1, 60?C. Your conclusion is the heat too high for watercooling.
I am not sure that it is the cause when I see our temperatures. Furtermore, I thought that the cause might be the RAM overheating but even at the beginning of benchs, when the RAM is cold, the problem appears. According to me, the causes may be either the VRM circuitry, not stable enough for high voltages. Or the GPU which does not like too high voltages. I tested on around 7 290/290X cards and every card encounters the same problem.
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