My brother sent me 2 "Radeon RX 480 (8gb) cards", and challenged me to build a new machine based upon them. I'm looking for recommendations for a MB that can utilize them to their best. I'm getting very mixed and, contradicting, results searching online. I'm looking at RAM capacity, PCI-e slots (2 16x preferably), crossfire availability, etc.
Advice and comments are greatly appreciated!
I can't let my big brother win this years challenge (I've lost the last 3).