I didn't mention, that I am useing SS. Sry. I am setting my startup according to the temperature I (cooling) can handle. I run several Orthos'es for few hours with max voltage and monitoring temp readings. If it stays normal, I set clock according to the max voltage.
And so I was testing the QX6700 when that firework happened. Cooling was water (chiller).

I do not have any Orthos screens - there was no reason to make those.