Neither of these takes is necessarily incorrect. Officially yes, out of the box it's 1x PCIe 2.0 and you get ~500 MB/s. There is also an boot flag to switch the PCIe from 2 to 3 and it doubles the speed to ~1000 MB/s. That mode is not officially certified as PCIe 3.0 compliant though due to the way its run but it seems to work for just about anything so long as you don't use a really long ribbon cable. https://www.jeffgeerling.com/blog/2023/forcing-pci-express-g...
