Multiple monitors not working 2x RX 570


2x Sapphire Nitro+ RX 570 4GB

Asus Maximus Hero VI

Windows 7 64-Bit

Radeon Software 17.4.4


Trying to run 3 monitors. Windows only ever detects the first monitor regardless of which video card I plug them into.

Please help. They were all working before when I had a GTX 760 and GTX 550 Ti as my video cards.