Three hd7970 = OS hang

[KT819GM]

Possible that VRM overheating if waterblock sat wrong, hope you left windows installed, so you could try to run GPU-Z and check, as on linux don't know how to get info from these sensor. Why do I think so? Because I buy some time ago EK waterblocks for HD6990 and saw that gap on some parts were bigger than written on manual. Because of that had to put my own thermal pads. Wrote to EK, but got an answer that they do no mistakes