The Mac Pro 3,1 (known to me as Yui) has reached its final hardware form.
Final specs, since parts have been rearranged for the Ryzen build:
OS: macOS Mojave 10.14.6 (Catalina runs, but I lose Japanese input, I’ll try again with later Catalina versions at some future time if the hardware hasn’t failed by then)
CPU: 2 x Quad Core 2.8GHz Xeons
RAM: 28GB (thanks @jaysee)
GPU: Flashed Mac EFI GTX 680 (thanks again @jaysee)
SSD: Samsung 870 EVO 250GB in a PCIe Card
HDD: 1TB Seagate for backups and local storage
USB-3.0: CalDigit PCie card (I’m going to guess it is pretty similar to a Sonnet, installed drivers last night, works).
That’s all she wrote, folks. Let’s just marvel that this thing has lasted and remained productive running a modern operating system for 12 years.