Uli Plank wrote:I'm not sure it makes much sense to invest into the classic MacPro these days. I'll update my signature hardware list once it's all working. Also make sure you do at least a pro-forma Mojave installation so you accomplish the firmware update from 00 to 144.0.0.0.0. I also was not able to get the Solarflare 10GbE Ethernet card that had worked fine in High Sierra to work at all in Catalina, so I ordered an Aquantia AQC107-based card. The TDP of the 5700 XT is 225-watts, and therefore presents no special challenges to the factory power capabilities of the 5,1 Mac Pro. The PowerColor 5700 XT version that I have uses a 6-pin and an 8-pin power connector, so you'll need mini-PCIe power cables of each.
Now that I have a separate Win10 machine, I *hope* that I can get along without using the option key to go between OS boots simply sliding in the boot SSD that I want. I 'needed' the flashed video card when I routinely went back-and-forth between Win10 and macOS.
It now has a normal (un-flashed) Radeon 5700 XT. It had been at High Sierra with a flashed Nvidia GTX 1070. Just two days ago, I was able to get Catalina working in my 12-core 2010 Mac Pro.
