I just bought 3 Vega 64 cards, and my motherboard is Asus Z370-E, i3 CPU, 4GB Ram, 850W Power Supply. And one of the cards is not working fine and it over heats if I used it alone and disconnected the other 2 cards.
If I connected the 3 cards it works but in a very bad performance, it starts with a good and high performance then it goes down even the leds on the cards once I used it it's fully on then it starts to go off to only two leds.
I though that maybe the power supply is the problem so I've disconnected the other 2 to give this card the full power but still. I even changed the PCI slot and still the problem exists.
Is it a hardware issue, should I return it?