Thanks for your AWESOME recommendations. We bought a Samsung 970 EVO Plus SSD 1TB M.2 NVMe (MZ-V7S1T0B/AM) and a Aquacomputer KryoM.2 Evo PCIe 3.0 x4 Adapter to replace our 1TB Sansung 850 Pro SSD on an Apricom PCIe card. We installed them in our 2009 Mac Pro 4,1 flashed to 5.1 dual 6-core 3.33Ghz 32GB RAM with a
MSI Gaming Radeon RX 560 128-bit 4GB GDRR5 DirectX 12 VR Ready CFX Graphcis Card (RX 560 AERO ITX 4G OC) running Mojave. EASY super simple installation since we booted off the 1TB Samsung 850 Pro SSD then used SuperDuper! to clone this drive the the Samsung 970 EVO Plus NVMe m.2 flash drive.
Black Magic Speed Test went from 470 MBps (850 Pro on Apricom PCIe card) to 1400+ MBps (970 EVO Plus on Aquacomputer KryoM.2 Evo PCIe card)... yes a 3X speed increase for ~ $300 total.
AWESOME !!!
Yes we know we could have gotten 3,000 MBps using a much more expensive OWC Excelsior PCIe card but were concerned that it could be problematic if we upgrade to Catalina (or newer) macOS using DosDude1's patchers. Aquacomputer KryoM.2 Evo PCIe is a "dumb" card which shouldn't be an issue moving forward with newer versions of macOS.