@ajzride Gotcha, at least restoring is pretty easy. Passthrough is pretty straightforward, just be sure to passthrough the entire device including audio sub devices and it should "just work", been very reliable for me.

@olivierlambert Was never able to get any information out of AMD, so I bought a used FirePro S7150x2 and it works as anticipated, so the issue does appear to be the RX550 does not support mxgpu.