We Test PCIe 4.0 Storage: The AnandTech 2021 SSD Benchmark Suite
for anyone that has a very new motherboard/chipset with proper PCI-E 4.0 support, and wants to add a lot of NVME M.2 format storage (in addition to the on-motherboard M.2 slots), take a look at this:https://www.asus.com/ca-en/Motherboard-Accessories/HYPER-M-2...It costs about $70 USD.In a single socket ryzen zen3 workstation you'd typically be able to use one of these. One PCI-E 4.0 x16 slot for your video card, one slot for this.