I have an RX 580 and a W7000 coming next, we'll see how both of those work out for me.
Update 1: My used FirePro W7000 from ebay was delivered yesterday.
Sleep wake, port 1, and port 2 all work fine, more or less OOTB. Port 3 and port 4 don't work until the system sleeps and wakes - after that, port 3 and port 4 work fine too.
None of the following attempts fixed the port 3 & 4 problem: After dumping the vBIOS, I defined the connectors with a KextsToPatch change in clover
using this guide. I also defined the connectors using a Whatevergreen SSDT file
based on Sample.dsl. I've experimented with and without iGPU, with and without Whatevergreen, with different monitor manufacturers, with macOS 10.13.3, and with macOS 10.13.4 beta 3.
Update 2: Disabling CSM fixed the problems above, however the system boots to a black screen.
Update 3: Flashed the W7000 with a UEFI-capable vBIOS from 015.022.000.004 to 015.037.000.001 which fixed boot to black screen.
Update 4: Booting the BIOS, Clover, and macOS all work fine with CSM disabled. But oddly, reinstalling macOS 10.13.3 and installing the supplemental update required temporarily turning CSM back on. Also, sleeping results in an instant wake. That's all for this weekend. I wouldn't necessarily recommend the W7000, but I'll keep it for a while. I'm trying vBIOS 015.025.000.001 as well.
