Just to add my little stone.
I had 2 860i units replaced by Corsair since they had the (shut)down syndrome.
of these two replaced units,
One sits in a X79 system now (with an SLI) that draws about 650w and it is the happy part of my story : all works well.
The other one sat on a shelf for a while and I recently installed it in an all new system (Z370) and it has given me a shut down out of nowhere already.
That is about 1 week after first use.
The system is not overheating at all, cpu, gpu and VRMS are at about 50% of their tmax under full load. MAX!
I was watching youtube (not a big deal for a 8600k and a gtx980ti) and Poof, it shut down.
I tried to push the power button but nothing worked.
I had to shut down the psu (rear on/off), wait about 15secs and then power it up again for the system to power back up.
I will probably send this unit back again.
My question is : is the problem now solved with this black/white 860i's?
I have to say the Corsair service is excellent, but I'm tired missing my top notch psus, shipping them and paying for it :)
Regards,
H.