HT5918 how to connect 6 DVI Displays to MacPro

Apple states can connect up to 6 DVI displays to a MacPro explanation is not clear. Mixes Mini-Display and USB terminology. What does it mean? 

The article you linked to includes:
Mac Pro supports a total of two single-link DVI displays. If you connect a third DVI display using a passive adapter or a display via HDMI, it will cause one of the three displays to become inactive.
Can I connect more than 2 DVI or HDMI displays?
Mac Pro supports a total of two DVI or HDMI displays when connected via the built-in HDMI port or using the Apple Mini DisplayPort to DVI adapter. To connect additional DVI displays, use an active DVI adapter such as the Apple Mini DisplayPort to Dual-Link DVI adapter. You can connect up to six active adapter DVI displays. This requires a powered USB hub since Mac Pro offers four USB ports and you will need six to connect them all.
If your display are 1080p pr less they you can use 2 standard/passive mini displayport to DVI adapters and 4 active mini displayport to DVI adapters. If 1080p or less you do not need the dual-link adapter which are active. Yo can get less expensive active adopters.
If any of your display are greater than 1080p you need the dual-link adapter. Those included a connection to USB for power. These cost about $100 each for the Apple branded ones

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