My pc shuts down unexpectedly using Corsair XH1000i. I have 4 GPUs drawing around 700 W from the wall and my systems gets unexpected power loss too often. Sometime even when I just install a driver or even when entering bios. Strange thing is that I managed to mine for a couple of minutes with around 750W from the wall (of course after a while again an unexpected reboot ocurred) and then I even get unexpected reboot at 150 watt power draw!

When I changed back to a gold 850 psu everything was fine.