Ahh…my bad. Apparently I read wrong when skimming. I took JD’s comment on 500mb/s write as being an nvme drive that was performing per your sata drive results.
No you are kind of right

JD's comment was about my EX920 NVMe drive. It is only performing at around 500mb/sec writes, and that is much less than it should be and less than the performance I originally had when it was new and running in a PCI-e riser card in my old PC (the last screenshot I posted).
But I don't see any obvious reason for the reduced performance. The health of the drive is good, I don't see anything amiss in the BIOS setup (there isn't much there to change actually), so I'm not sure what is going on. There were performance issues on some SSDs with Windows 11 patches, but those seem to hit both read and write. Not just write like I'm seeing.
Nothing in my motherboard manual that indicates a loss of performance on the PCI-e 3.0 slot now that I've populated the PCI-e 4.0 slot.
I'm at a loss I'm afraid and my Google-Fu isn't yielding much help.