External GPU support does not sound like big deal, except it's one of the biggest processing changes to FCPX in while. Apple had the opportunity with X to move away from CPU calculating of tasks and move the pixel processing operations to the efficient graphics card.. because FCPX followed OS rules, it became candidate for harnessing this extra power. Michael P Schmidt had been testing eGPUs with FCPX and it seemed that with Mojave, GPU was still being used for rendering. .. Well, with the release of Mojave, ation page on using Final Cut Pro X and eGPU.. Michael got to work straight away again and he came up with some interesting findings. So with Mojave, FCPX can now 'prefer eGPU for nearly all the tasks that require GPU, so there is performance gain to be had. Who knows, and this update means that users can now get performance update to their existing machine This will be good for users. First of all you need Mac that supports Thunderbolt 3, have Mojave installed and of course GPU like Blackmagic model. Apple has list of recommend GPUs and enclosures here. It looks like the Sonnet eGFX Breakaway Box 650W would be the one to go for..
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