External graphics card on Xavier AGX

Is it possible to run a Nvidia graphics card (Quadro, RTX, etc.) in a Xavier AGX? This has been asked before, but there is not a clear answer.

I’ve tried to put together the threads I’ve found on this issue below. Sorry for the thread numbers, but as a new account I can only put in one link, and I used that for the link to the working case.

In 2019, in the thread 65310 @dusty_nv said that it was planned for a future release. There is a link to a FAQ, but the updated FAQ does not seem to address this.

In 2021, @1197419645 posted a video a GTX1080TI apparently working in a Xavier AGX, however no software versions were given. If @1197419645 has more details and could post them, that would be helpful.
Add external graphics card on Jetson AGX Xavier Developer Kit - Jetson & Embedded Systems / Jetson AGX Xavier - NVIDIA Developer Forums

In 2022 @dusty_nv posted in thread 202793:

those PCIe drivers and discrete GPU aren’t supported on Jetson devices running JetPack-L4T

I’ve tried to install versions 460.67, 470.129.06, 510.73.05 and 515.43.04 of the “NVIDIA Linux aarch64” driver, but always get the error:

The kernel was built with gcc version 7.3.1 20180425 [linaro-7.3-2018.05 revision d29120a424ecfbc167ef90065c0eeb7f91977701] (Linaro GCC 7.3-2018.05) , but the current compiler version is cc (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04) 7.5.0.

I ignore and continue with the install but eventually get the error:

ERROR: Unable to load the kernel module ‘nvidia.ko’. This happens most frequently when this kernel module was built against the wrong or improperly configured kernel sources, with a version of gcc that differs from the one used to build the target kernel, or if another driver, such as nouveau, is present and prevents the NVIDIA kernel module from obtaining ownership of the NVIDIA GPU(s), or no NVIDIA GPU installed in this system is supported by this NVIDIA Linux graphics driver release.

This error is also noted in thread 154659

I’m currently using train_ssd.py and get about 15 images a second on the AGX and 15 images a second on the graphics card (when installed in a PC.) I’d like to combine to reduce the training time and also use less power.

Will this be supported either in Jetpack 4 or 5 or some other way? Is it possible to get it to work without it being supported?