this Mac Pro graphics card supports:
"up to six 4K displays,
two 5K displays, or
two [6K Apple] Pro Display XDRs."
(the two HDMI ports support HDMI 2.0, good for up to 4K at 60 Hz each)
You don't need a new at card, but you DO you need better advice from someone who knows something about displays and interfaces.
That Shmsung display is like the top half of a 5K display. You must meet performance requirements for a 5K display, but you end up with only the top half worth of picture area -- great for gaming. If that is what you wanted to buy, great. If that is different from what you wanted, get a single display or multiple displays that better meet your needs.
Interface
Display Port
1 EA
Display Port Version
1.4
HDMI
2 EA
HDMI Version
2.1
at this level of performance, there are strong additional requirements for the cables and interfaces required.
You could connect that display using a single ThunderBolt to DisplayPort cable/adapter, but it would have to be a Top-Spec that is appropriately short.
Such an adapter/cable would have to be capable of supporting a 5K display, typically rated for DisplayPort 1.4 or higher. The portion of cable from the computer to the adapter electronics is limited to one meter max, and the portion of cable from the adapter electronics to the display is limited to one meter max.
if the. cable/adapter does not prominently show those specs, it is not suitable, and the Mac will not use it.
The HDMI 2.0 supported by thew Mac can one support a display as larger as a 4K display on ONE cable.
Another approach is to think of the display as two logical displays, side by side:.
• on the Mac, connect two certified PREMIUM HDMI cables to two HDMI ports on the graphics card. You will eventual "Arrange" these two half-displays as halves of one Extended Desktop, placing them side-by side in the proper orientation.
• on the display, use the supported Picture-By-Picture mode to place the two pictures side-by side on the screen.
