No longer the case in Mojave with a cMP and Sapphire Pulse RX 580 8GB.neither the cMP or the cylinder have avhcd/hvec engine built-in on cpu or on guenuine GPU . So the work is mainly (and poorly) done by the cpu like a traditional work , not like the new I9 ot i7 and the new GPU.
Admittedly Mojave is still in Beta but HEVC is coming to the cMP and the nMP will likely never get it.
OP, sell your nMP while you can and pick up a Dual CPU 5,1 cMP. You can then add an Amfeltec card with some NVME SSDs for storage, an AHCI PCIe SSD for boot, a USB 3 card, perhaps a Sonnet Solo 10GbE card and a Sapphire Pulse RX 580 8 GB.
This, along with Mojave release in September will keep you going nicely for a while. It’ll blow the socks off your current nMP.
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