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I haven't run FCPX so I can't attest to that but it does work for a non igpu solution for RX cards in X99 boards. If you have them try them.
It works in Luxmark (open CL) benchmarks, and Uningine (open GL) benchmarks without any major hiccups. Nvidia 8400gs and RX 460 and RX 480 were tested by me others have tested various cards with the same success. The RX needs to go in the number 2 slot or you will suffer black screen issue.
Running the 970 with Nvidia drivers may present issues but a 960 was just tested and it ran with an RX card.
Disclaimers: Most CPUs only have 16 pcie lanes so when you use slot one alone it's gets 16 lanes (max performance). When you use slot 1 and slot 2 slot 1 gets 12 lanes, and shares 4 with slot 2. So performance for both cards gets reduced slightly.
X99 systems (and or Xeon chipsets) may have more pcie lanes supported so it shouldn't effect performance as much if at all.
If it works, let us know how well, I'll bet you could get some good benchmarks with that combo.
So after some reasearch I'm going to order a RX480. Do you know which brand would be the best? I was looking at the MSI one. As for using them at the same time, I'm gonna try to tinker with it and see if I can get it working or not. It hopefully shouldn't be to hard