So I’ve got a Mac Pro 5,1 with an RX580 8GB, that is feeding two ASUS Pro Art Monitors. I want to connect them via Display Port, which works for all systems except Sierra. I run Sierra for legacy Final Cut Pro 7 and its associated software, iDVD, iMovie stuff as well as BlueRay burning, etc. If I connect two HDMI cables - it will show everything, OpenCore boot menu and allow me to boot into Windows 11, Sonoma, Monterey and Sierra. All good - just don’t know why Sierra shows a black screen if I connect two DP connections. However, everything else works fine with two DP connections. So it’s a bit of a mystery as to why it won’t work. I know High Sierra and above works. Has anyone seen this running an RX580?
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