Recently bought 2x(MSI R9 390 8G Gaming), and noticed that they don't need a Crossfire bridge. I have them both plugged into PCI-E 3.0 x16 slots, (obviously PCI-E power supply is connected to cards too).
Only one card showing up in Device Manager, no Catalyst options for Crossfire. Documentation with cards from MSI was non-existent. Any advice or directions towards a tutorial on how to get these both setup so I can get my 4K gaming on?