新的 Mac Pro 在 Catalina 系统下最高支持 4 * 2 MXM 显卡，eGPU.io 其他网友说应该也是支持 PCIe 显卡。注意，并不是能够识别，而是能在 FCPX 里双显卡加速。
原文：
GPU-Related EnhancementsApple did not talk about eGPUs at all, but they did go all out with the new Mac Pro and PCIe expansion, and introduced an interesting selection of Vega II GPUs. However, there are some very interesting under-the-hood improvements in Metal this year: - Maximum Number of eGPUs: The new Mac Pro supports "up to 4 GPUs" configured as MPX modules. In my opinion even standard GPUs should work, just like the older Mac Pro (or at least I don't understand the restriction enforced on a non-MPX but PCIe-standard GPU). However, the Mac Pro can have a lot more than 4 thunderbolt ports. Given that 4 eGPUs are already supported, we might infer then that theoretically we could run the Mac Pro with 8 GPUs (4 + 4), or if there is a hard limit of maximum supported GPUs/framebuffers - only 2 eGPUs would be allocated on a 4-GPU Mac Pro. I think the maximum active GPUs on macOS I've seen is 6 total - which would add up if looking at the rest of the Mac lineup. It would be an interesting experiment to test this on the Mac Pro(though, the need for an eGPU vanishes with a device like this).
https://egpu.io/forums/mac-setup/macos-catalina-tidbits-egpu-updates/
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