Can't connect two DVI connectors to Power Mac G5 (Late 2005), Mac Pro (Original), and Mac Pro (Early 2008) video cards

Certain video cards that ship with Power Mac G5 (Late 2005), Mac Pro (Original), and Mac Pro (Early 2008) configurations may require the use of a DVI extension cable to allow more than a single DVI connection to be made.  This may affect both Apple displays as well as displays not made by Apple.

 Power Mac G5 (Late 2005) NVIDIA GeForce 7800 GT
NVIDIA Quadro FX 4500
 Mac Pro (Original) NVIDIA GeForce 7300 GT
NVIDIA Quadro FX 4500
 Mac Pro (Early 2008) NVIDIA GeForce 8800 GT
NVIDIA Quadro FX 5600
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This can occur if the DVI connector size on certain display cables prevents two cables from connecting to a single card at the same time.

A cable is provided in the box with any computer that shipped from Apple with these video cards.  The cable (below) is a DVI extension cable, with which you can connect two DVI displays at the same time. 

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