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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?
Yes, that is what is reported once the Mac OS is fully booted up and running.

I do have iStat Menus as well as iStatistica Pro. Both are reporting the GPU stats.

Screenshot 2023-08-09 at 10.25.28 AM.png
 
Yes, that is what is reported once the Mac OS is fully booted up and running.

I do have iStat Menus as well as iStatistica Pro. Both are reporting the GPU stats.
Thanks again, thanks to your comments, I decided to buy rx6900xt and it works great on the main monitor, while 580 draws pixels for two peripheral monitors)) it's a dream!
 
Question…

I have a Gigabyte 6900XT which requires 3x power cables.

I want to add another 6900XT… how?! Can I daisy chain the cables somehow?
 
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