Keep your existing displays while using DisplayPort sources. With the DP2DVIFA (DisplayPort to DVI) active adapter you can connect a DisplayPort source to a DVI-D display. This adapter supports resolutions up to 1920x1200 allowing you to take full advantage of a single link DVI capability.
Pros: Initially worked, displayed the connected monitor with the correct resolution.
Cons: After resuming from sleep mode, would no longer recognize appropriate resolution for the connected monitor. Reboots, drivers, etc. did not solve the problem. The unit was used to replace one by a different manufacturer that failed after six months. This one was worse, not worth shipping back for RMA.