1 of my 2 cards ended up being bad. EVGA is being quite accomodating about it and cross shipping me a replacement but still a bummer after waiting like 10 days to end up with a bad card. The bad card was causing the system to fully shut down immediately once it began using more than 3GB of video memory. At lower resolutions it was ok, but @ 1440p or 4k it'd crash the system every time (full PC shut-down). Seemed like a possible power issue so I spent time swapping out supplies, swapping card positions on the board, checking temps, etc. Eventually I tried 1 card at a time, and when playing at those higher resolutions, the 2nd card I received would always hard-shut down the PC.
So now we wait again... lol.