i upgraded my Mac Pro 2009 from High Sierra to Mojave in October.
At the same time, since Mojave only supports graphics cards that are Metal-capable, i upgraded my old graphics card to SAPPHIRE Radeon PULSE RX 580 8GB GDDR5, as recommended in Apple website.
Since the graphics card is made by...
Okay so... Bought a 2009 Mac Pro about a month ago, Worked great, did the 5,1 firmware flash, worked great. Bought ram, CPUs, and a GPU to upgrade. Started with the CPUs X5690's, delidded them myself, pretty sure I killed one of the CPUs. was getting both CPU led lights.
So anyways I tried...