Three hd7970 = OS hang

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Hmm one more idea.
Plz try connect 8+6 power cables from diffrent line. I dont know how good explain it in eng ;/ Idea is to connect each gpu to 2 psu: 8pin from one and 6 pin from second. Mayby psu dont got enought power from one line to work fine with 7970

Tried. didn't help

My current idea is that it is somehow related to heat. As long as it stays < 50c it seems runs stable. It's hard to find out as it goes up to 60c pretty quick