Ok I just got some new information regarding my problem getting "cannot get target temperature, error 15/999"

I tried ethOS and same thing happened there, i guess that rules out any os/graphic drivers issues because my friend have the exact same rig and it worked flawlessly in ethos.

I have swapped the usb risers as well with no success.
The only thing i can Think of is my PSU now, when all 6 cards are at 100% Power , around 900 watt, it almost instant.
But if i turn it down to 65%, the whole rig takes 650w from wall, it runs without crashing.

I am using molex directly from psu to Power up to 2 usb risers per Cable, instead of doing the sata to molex convertion.
My psu is ax1200i. Can I use the corsair link to somehow see if there is any problem with the psu or maybe change something there that could help me?

All these crashing is btw even with stock setting, no oc at all.

What do you guys Think?