Yes, that is what is reported once the Mac OS is fully booted up and running.Oh, this is very helpful!
That is, if monitors 1 and 2 are connected to the ports of the rear I/O Card ports thunderbolt (mpx module 580x will be the controller of these ports), and monitor 3 is connected by hdmi to the rx6900xt card, and is assigned as the main one in the system settings, then the main video card will be rx6900xt?
Do you use programs like iStat Menu? Tell me, does it reflect the statistics of the rx6900xt GPU, video memory, and also the temperature?
I do have iStat Menus as well as iStatistica Pro. Both are reporting the GPU stats.