I just acquired a Mac Pro (Mid 2010), 2 x 3.46 GHz 6-Core Xeons, 32 GB 1333 MHz RAM, 250 GB SSD, 1 TB HD, NVIDIA GeForce GTX 980 Ti 6144 MB.
I did a full format and reinstall of the OS on the SSD and am currently running High Sierra (10.13.6) (though I initially tried using a dosdude1 patched...