I have two Radeon R9 285 connected to a PCIe switch but it seems the crossfire is not enabled. Can anyone from AMD team tell me what specifically needed for XDMA to work. The option to enable crossfire is not available in Catalyst either. Both graphics card are visible in PCIe tree, I assume they send data to each other through the switch. I am using Catalyst version 15.7.1.
I did some research on this forum. Seems like 15.7 works.
Update: same issue with 15.7 on Windows 8.1 64-bit.