Dual graphics cards and single 4K display - Mac Pro (late 2013)

I'm considering a new Mac Pro as my next graphics/development workstation. I see that the new Mac Pros have dual graphics cards (i.e. dual D300, D500, D700.) I was wondering if there is any benefit to having the second graphics card if I only have only one 4K display connected via Display Port 1.2? Would the two cards work in tandem to output to the single 4k display? Can the second GPU still be used for OpenCL, even if it is not connected to a display?
Thanks

There is no option to have only one Dxxx, and yes some apps do and no the number of displays does not affect video output.
Whether it is right for you vs say a maxed out iMac or something else is something you should continue to research and consider.
www.barefeats.com and www.macperformanceguide.com as well as other forums and sites.

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