Interesting related article for those confused (like I was!) by the jargon.
https://digitalworld839.com/difference-between-nvme-vs-pcie-ssd-explained/
Note this statement: All you need is a memory space in RAM where requests are copied to the NVMe SSD to speed up data access. This is crucial, for example, for applications that move large files, such as texture atlases in 3D rendering or large-capacity video editing files.
Granted I don't do much with files that large. But would more RAM speed up the NVMe drive under some circumstances, when I have several windows open? Any difference for the 2nd SATA drive (if it actually works)? That (SATA data drive would be where large file transfers might be occurring now and then.) Might come into play when doing backups?