I think someone else may have given you insight into this, but I'm running the original Radeon 5770 in my 5,1. The AMD 7970 Radeon runs Windows flawlessly and its BIOS boot is good. It will run it but it takes a lot of finagling. On the 3,1 though, Windows does not like to boot up, the 3,1 has some EFI issues with Windows 8 and 10. That's mainly why I have my Quad Core will the AMD card and the Titan X with the Eight Core. It requires a tiny tweak to one Kext on the MP 3,1 as it's 3d timing is off and anything 3D flickers. I was able to get rid of those pesky red and blue artifacts and get good 2d acceleration with the Radeon. It may depend the amount of RAM, Video RAM or GPU as I believe Snow Leopard hardware wise was made for 16GB Ram or less. I also looked up that the Mac Pro 4,1 and Mac Pro 5,1 should be compatible with Snow Leopard. Video on the installer is sharp and no lag or tearing. Snow Leopard 10.6.3 Client Installer booted on my Mac Pro 3,1 2008, Quad Core with the AMD Gigabyte Radeon 7970 3GB Video Ram, 14GB RAM. I am very pleased with High Sierra on my unsupported Macs. I will be great to see what Macs get supported again with Mojave. If there is one or if someone starts one, I'll add my stuff there. Someone could startup a Snow Leopard Server / Workstation thread elsewhere. ![]() Won't mention much more on this subject as I know this is a Mojave thread. As mentioned before could also be the video card. Could be the mode it is trying to startup in 32 vs 64. ![]() This may explain why some systems capable of running Snow Leopard can't. I can stick my original NVIDiA card but I just hate doing that stuff. VMware 8.5.7 Pro installs and runs it fine. Parallels even has a hard time with 10.6.3 server which is bogus. I do have my original NVIDiA card and I also have a AMD 7970/7950, i always forget which on thst is. It should run if I turn the web drivers off on the card.
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