Advantage/disadvantage two graphics cards in Mac Pro?

I'm working on an unfamiliar edit suite. They've installed two graphics cards in a late model Mac Pro. The second monitor isn't responding properly ... it's a black screen when it is supposed to be a full screen display of whatever is on the timeline.
A Mac Tech support article says: "Final Cut Studio applications may exhibit unexpected behaviors when used on a Mac Pro that has more than one graphics card. Unexpected behaviors may include rendering issues, Digital Cinema Desktop display issues, and window display issues."
The Tech support article says to pull one of the graphics cards.
This isn't my system. What is the advantage to having two graphics cards in a Mac Pro?
I want to pull one to make the 2nd monitor respond correctly. But I have to justify this to the owners of the suite.
All ears,
Ben

Hi guys,
I disconnected one card. Working with a single monitor there are is no more crashing with FCP. The card I'm using has a DVI out and two miniDisplayPorts. I'm looking around for an adaptor (or two) to go with the two miniDisplayPort outs. The card is an ATI RADEON 5770; I think it will support up to three monitors, two for sure.
There is no one in the suite here at present ... I've been poking around for the adaptors. I think canceling out the second graphics card may solve all my problems.
Thank you kindly for your help,
Ben

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Advantage/disadvantage two graphics cards in Mac Pro?

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