The accelerated Vega iGPU drivers are in Linux 4.15 which would be needed for Plex transcoding presumably.  We only include the Intel iGPU drivers at this time but we're open to including Vega iGPU drivers when we upgrade kernels, Plex supports it and the Vega iGPU drivers don't conflict with normal dedicated AMD video cards that would normally be used for passthrough.
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