I also just tested with an Nvidia 3080 Ti installed. Got some errors still (see https://github.com/geerlingguy/sbc-reviews/issues/62#issuecomment-2852490521), but one other weird issue: when I shut down the system, it was still powering the GPU, it seems—it was consuming 26W total power through the PSU, and luckily on the EVGA card I have, it ramped the fans to maximum thrust to make sure it wouldn’t overheat with the system off.
I remember that was an issue on older firmwares like with Warning, nearly cooked my AMD Pro while the Orion was turned off — is this still an issue on the SystemReady 9.0.0 firmware?
Seems like there was a link to this: https://github.com/radxa/edk2-platforms/commit/37aa58ffc9d5987d551d824870c1f05e717fc81b (but not sure if that’s in any active firmware).