new PC constantly freezes while gaming (4k resolution)

i7 6700k 4.7ghz
EVGA FTW Gtx 1080 SLI, both oced
32gb Ram
gigabyte z170 gaming 7 motherboard
Dual 4k monitor, using nvidia surround 7680x2160, gaming with 4k res
PROBLEM: PC freezes constantly while gaming, but only 4k though, overwatch league(1920x1080) works fine, witcher 3, gta5 etc with 4k res cant last longer than 10 minutes, computer just freezes completely and restart itself or i have to restart manually, I think the driver is fine, also reinstalled win10 a few times, nothing is fixed. The only possibility left in my mind is the card themselves, or maybe it isn't, what other parts could it be that might cause this type of problems, and how can i test which card is causing the issue? should i just run single card for both cards? and also i bought them in August from the local retail store Canada computers, but the warranty is with EVGA only. Does overclocking gpu void warranty? Please help :( i really don't want to go thru the RMA, its so frustrating. Thank you all in advance!
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  1. Best answer
    Check ur psu watt. U sure ur psu is enough for your gpus?!?!
    And in my country unfortunately if u overclock ur.Warranty goes away... at least in my country its true donno ur country...
    And unplug 1 of ur gpu and run again
    And also turn off some graphical factors and lower them on medium and try it again
    Check the temperature of cpu. Gpus too...
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