Probably the system is overheating... I had a similar issue with mine especially during the summer.
You seem to be right, running the card that's hooked up to the monitor at a lower intensity helps.
Topic: Black screen and cards stop mining (Read 2236 times)
You seem to be right, running the card that's hooked up to the monitor at a lower intensity helps.
you did not set up your crossfire properly causing your graphic card to crash. Or your overclock-ed your GPU too much that it is not running in a stable state. I used to experience that but solved when i set up my crossfire and also clock my GPU properly.
Probably the system is overheating... I had a similar issue with mine especially during the summer.
NaN.
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