Maybe he will come back and admit that it was not he, but a friend who had it working with the right monitor interface.
Cards like the one mentioned come with cables to adapt to different monitors, including legacy types. One might think he can have three outputs because there are enough connectors. But one has to read the documentation.
The AMD card will drive three monitors and more if the monitors are all of the type required. Other combinations are possible, but at least one out of three has to be the new kind of interface.
DisplayPort is a digital display interface developed by the Video Electronics Standards Association (VESA). The interface is primarily used to connect a video source to a display device such as a computer monitor, though it can also be used to carry audio, USB, and other forms of data.
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