DIY SSD - BEST MEMORY SOLUTION FOR MAC?!

I'm thinking of replacing it with an OWC Express 4M2 So if I could load up the OWC Express 4M2 with four 4TB NVMe drives

PCIe and NVMe drives replace the system I'm used to I was briefly looking at an OWC device

gen 4 ssd in gen 3 slot OWC Express 1M2

pcie 4 in pcie 3 slot ssd PCIe and NVMe drives replace the system I'm used to I was briefly looking at an OWC device