How do you make it run at full load? My 6900xt hardly works in FCPX
I haven't really looked into this, but there have been discussions in the past about getting FCPX to use the dGPU. I think one of the major factors is the SMBIOS. If you use an SMBIOS of a Mac that doesn't have an iGPU, like a MacPro, you can get the dGPU to do most of the functions. If you use an SMBIOS of a Mac that has an iGPU, it will split the workload between the iGPU and dGPU.
However, if you change the SMBIOS while you may gain a function, you may lose another. For example Sidecar will only work on an SMBIOS with an iGPU, like an iMac. Similarly, watching DRM protected videos seem to require a specific SMBIOS (I don't recall what the specifics are; I don't watch videos on my Hack).
Other than that, there are tutorials on the web that describe how to offload the work onto the dGPU. I haven't used FCPX in a while, but I seem to remember last year there was a setting in the Preferences where you could specify to use the dGPU for encoding.
See if there is something useful in this thread:
Hello, I have been trying to find out if my GPU should be utilised when Final Cut X renders, transcodes or exports a project. I have watched the activity monitor and the GPU does not look like it is being used and the processor seems to be doing all the work. However, when I use DaVinci Resolve...
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